> For the complete documentation index, see [llms.txt](https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/.spec_system/archive/sessions/phase36-session04-theme-audio-routing-contract/implementation-notes.md).

# Implementation Notes

**Session ID**: `phase36-session04-theme-audio-routing-contract` **Started**: 2026-06-28 17:08 **Last Updated**: 2026-06-28 17:37

***

## Session Progress

| Metric              | Value     |
| ------------------- | --------- |
| Tasks Completed     | 19 / 19   |
| Estimated Remaining | 3-4 hours |
| Blockers            | 0         |

***

## Task Log

### 2026-06-28 - Session Start

**Environment verified**:

* [x] Prerequisites confirmed
* [x] Tools available
* [x] Directory structure ready

***

### Task T001 - Verify Prior Audio Artifacts And Asset Baseline

**Started**: 2026-06-28 17:08 **Completed**: 2026-06-28 17:08 **Duration**: 1 minute

**Notes**:

* Verified Sessions 01-03 validation reports all passed before this session.
* Confirmed current docs describe theme-aware ambience as deferred to Session 04/05.
* Confirmed no final Session 05 theme ambience assets are present under `src/assets/ai-rogue/audio/music/`.

**Files Changed**:

* `.spec_system/specs/phase36-session04-theme-audio-routing-contract/implementation-notes.md` - Created the session implementation log and recorded T001 evidence.

**Verification**:

* Command/check: `sed -n '1,240p' .spec_system/specs/phase36-session01-current-audio-balance-audit/validation.md`
  * Result: PASS - Session 01 validation result is PASS with audio balance audit evidence.
  * Evidence: Validation report records current browser-path audio behavior, no new media, and deferred theme-aware routing.
* Command/check: `sed -n '1,240p' .spec_system/specs/phase36-session02-enemy-audio-metadata/validation.md`
  * Result: PASS - Session 02 validation result is PASS.
  * Evidence: Validation report records typed enemy audio metadata and no theme ambience scope.
* Command/check: `sed -n '1,260p' .spec_system/specs/phase36-session03-enemy-and-boss-sfx-pack/validation.md`
  * Result: PASS - Session 03 validation result is PASS.
  * Evidence: Validation report records 23/23 tasks complete and enemy/boss SFX pack delivered.
* Command/check: `sed -n '1,260p' docs/extensions/ai-rogue/game-feel.md` and `sed -n '1,260p' docs/media-policy.md`
  * Result: PASS - Current audio docs and media policy were inspected.
  * Evidence: Game-feel doc assigns theme-aware music or ambience routing to Session 04/05; media policy defines AI Rogue music tracks under `audio/music/` with a 900 KB cap.
* Command/check: `rg --files src/assets/ai-rogue/audio && rg -n "theme_(cold_cache|corrupted_index|kernel_core|firewall|model_vault)_ambience|ambience|theme audio|theme.*audio" src/assets/ai-rogue docs .spec_system/specs/phase36-session0* src/extensions/ai-rogue/runtime || true`
  * Result: PASS - Current audio assets list only title, depth, victory, defeat, and SFX files; no final theme ambience files exist.
  * Evidence: Matches are docs/spec references only; no `theme_*_ambience.ogg` files are present.
* UI product-surface check: N/A - T001 changed only session notes.
* UI craft check: N/A - No user-facing UI changed.

***

### Task T002 - Inspect Current Audio And Renderer Lifecycle

**Started**: 2026-06-28 17:09 **Completed**: 2026-06-28 17:09 **Duration**: 1 minute

**Notes**:

* Inspected `runtime/audio.ts`: current graph has master, music, and SFX gains; `playMusic` owns title, depth, victory, and defeat; `stopMusic` clears active and pending primary music; dispose stops heartbeat and active music.
* Inspected `renderer-audio-adapter.ts`: descend events crossfade depth music and terminal status switches to victory/defeat, with heartbeat updated after simulation events.
* Inspected `renderer.ts`: fresh start plays run-start SFX and depth music; reset/load stop music and heartbeat; destroy disposes audio; initial mount queues title music before unlock.
* Inspected `themes.ts` and snapshot references: `snapshot.theme` is already typed as `AiRogueSectorThemeId` and flows from generated world state without UI or save schema changes needed.

**Files Changed**:

* `.spec_system/specs/phase36-session04-theme-audio-routing-contract/implementation-notes.md` - Recorded current lifecycle inspection evidence.

**Verification**:

* Command/check: `sed -n '1,260p' src/extensions/ai-rogue/runtime/audio.ts` and `sed -n '261,820p' src/extensions/ai-rogue/runtime/audio.ts`
  * Result: PASS - Current Web Audio graph, primary music lane, SFX lane, heartbeat loop, pending music, silent fallback, and dispose behavior inspected.
  * Evidence: `createAiRogueAudioEngine` creates master/music/SFX gains, defers pending music until unlock, and stops music/heartbeat on explicit lifecycle calls.
* Command/check: `sed -n '1,260p' src/extensions/ai-rogue/runtime/renderer-audio-adapter.ts`
  * Result: PASS - Adapter-level audio transitions inspected.
  * Evidence: Descend currently calls `playMusic(resolveMusicTrack(depth))`; won/lost states play victory/defeat primary music.
* Command/check: `sed -n '320,460p' src/extensions/ai-rogue/runtime/renderer.ts`, `sed -n '500,560p' src/extensions/ai-rogue/runtime/renderer.ts`, `sed -n '700,860p' src/extensions/ai-rogue/runtime/renderer.ts`, and `sed -n '890,970p' src/extensions/ai-rogue/runtime/renderer.ts`
  * Result: PASS - Renderer reset, load, start, descend, terminal, and destroy paths inspected.
  * Evidence: Fresh start, reset, load, and destroy paths have explicit audio lifecycle calls that can be extended with ambience stops/starts without changing simulation state.
* Command/check: `rg -n "theme:|snapshot.theme|themeForDepth|sectorThemeForDepth|AiRogueSectorThemeId" src/extensions/ai-rogue/runtime src/extensions/ai-rogue -g '*.ts' -g '*.tsx'`
  * Result: PASS - Theme snapshot boundary inspected.
  * Evidence: `snapshot.theme` is produced from `state.world.theme`, typed through `AiRogueSectorThemeId`, and currently used for HUD labels/palette-style presentation only.
* UI product-surface check: N/A - T002 changed only session notes.
* UI craft check: N/A - No user-facing UI changed.

**BQC Fixes**:

* None. Inspection identified the relevant cleanup, duplicate prevention, state freshness, and contract-alignment paths for later tasks.

***

### Task T003 - Create Implementation Notes

**Started**: 2026-06-28 17:10 **Completed**: 2026-06-28 17:10 **Duration**: 1 minute

**Notes**:

* Created this implementation notes file before code changes so each task can be logged before its checkbox is updated.
* Added session progress, environment verification, task evidence, BQC notes, design decision, and blocker sections.
* Established the per-task verification format for command evidence and UI/product-surface applicability.

**Files Changed**:

* `.spec_system/specs/phase36-session04-theme-audio-routing-contract/implementation-notes.md` - Added the implementation log scaffold and T001-T003 task evidence.

**Verification**:

* Command/check: `test -s .spec_system/specs/phase36-session04-theme-audio-routing-contract/implementation-notes.md`
  * Result: PASS - Implementation notes exist and are non-empty.
  * Evidence: File contains session progress, environment verification, task log entries, and BQC tracking sections.
* Command/check: `sed -n '1,220p' .spec_system/specs/phase36-session04-theme-audio-routing-contract/implementation-notes.md`
  * Result: PASS - Notes structure inspected.
  * Evidence: T001-T003 entries include files changed and exact verification checks before task checkboxes are marked complete.
* UI product-surface check: N/A - T003 changed only session notes.
* UI craft check: N/A - No user-facing UI changed.

**BQC Fixes**:

* None. This task created process documentation only.

***

### Task T004 - Define Theme Ambience IDs And Mapping

**Started**: 2026-06-28 17:11 **Completed**: 2026-06-28 17:17 **Duration**: 6 minutes

**Notes**:

* Added `AiRogueThemeAmbienceId` as the five-route contract for sector ambience.
* Added future Session 05 basenames under `AI_ROGUE_THEME_AMBIENCE_FILE_BASENAMES`.
* Added `themeAmbienceForTheme()` with exhaustive `AiRogueSectorThemeId` handling.
* Added a theme ambience URL lookup and test-only URL override hook so tests can exercise playback without committing Session 05 assets.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/audio.ts` - Added typed theme ambience IDs, basenames, URL lookup, resolver, and test hook.

**Verification**:

* Command/check: `rg -n "AiRogueThemeAmbienceId|AI_ROGUE_THEME_AMBIENCE_FILE_BASENAMES|themeAmbienceForTheme|THEME_AMBIENCE_URLS|__setAiRogueThemeAmbienceUrlsForTests" src/extensions/ai-rogue/runtime/audio.ts`
  * Result: PASS - Route type, basenames, lookup, resolver, and test hook are present.
  * Evidence: Matches found for all five contract pieces in `audio.ts`.
* Command/check: `bun run typecheck`
  * Result: PASS - TypeScript completed with exit code 0.
  * Evidence: `tsc --noEmit` produced no errors.
* Command/check: `bun run test -- src/extensions/ai-rogue/runtime/__tests__/audio.test.ts src/extensions/ai-rogue/runtime/__tests__/themes.test.ts`
  * Result: PASS - Existing focused audio/theme tests still pass after the mapping addition.
  * Evidence: Vitest reported 2 files passed and 16 tests passed.
* UI product-surface check: N/A - T004 changed runtime contract code only.
* UI craft check: N/A - No user-facing UI changed.

**BQC Fixes**:

* Contract alignment: The resolver uses exhaustive `AiRogueSectorThemeId` handling so future theme additions produce a compile-time gap (`src/extensions/ai-rogue/runtime/audio.ts`).

***

### Task T005 - Align Sector Theme Audio Hints

**Started**: 2026-06-28 17:12 **Completed**: 2026-06-28 17:18 **Duration**: 6 minutes

**Notes**:

* Changed `AiRogueSectorTheme.audioHint` to the typed `AiRogueThemeAmbienceId` contract.
* Updated all five sector theme hints to the matching ambience route IDs.
* Preserved existing theme IDs, labels, enemy tables, deltas, pressure labels, palette hints, and theme order.
* Normalized existing dash characters in touched theme strings/comments to ASCII hyphens for the session text-file gate.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/themes.ts` - Typed `audioHint` and aligned all theme hints to the ambience contract IDs.

**Verification**:

* Command/check: `rg -n "audioHint|AiRogueThemeAmbienceId|pressureLabel" src/extensions/ai-rogue/runtime/themes.ts src/extensions/ai-rogue/runtime/__tests__/themes.test.ts`
  * Result: PASS - Every sector theme now has a typed ambience route ID.
  * Evidence: The five `audioHint` values are `theme_cold_cache_ambience`, `theme_corrupted_index_ambience`, `theme_firewall_ambience`, `theme_model_vault_ambience`, and `theme_kernel_core_ambience`.
* Command/check: `LC_ALL=C rg -n "[^\\x00-\\x7F]" src/extensions/ai-rogue/runtime/audio.ts src/extensions/ai-rogue/runtime/themes.ts src/extensions/ai-rogue/runtime/renderer-audio-adapter.ts src/extensions/ai-rogue/runtime/renderer.ts || true`
  * Result: PASS - No non-ASCII characters found in touched runtime files.
  * Evidence: Command produced no output.
* Command/check: `bun run typecheck`
  * Result: PASS - TypeScript completed with exit code 0.
  * Evidence: Typed `audioHint` compiles against all theme records.
* UI product-surface check: N/A - T005 changed runtime theme metadata only.
* UI craft check: N/A - No user-facing UI changed.

**BQC Fixes**:

* Contract alignment: Theme metadata now points to the same typed ambience IDs used by the audio resolver (`src/extensions/ai-rogue/runtime/themes.ts`).

***

### Task T006 - Add Low-Gain Ambience Lane

**Started**: 2026-06-28 17:12 **Completed**: 2026-06-28 17:19 **Duration**: 7 minutes

**Notes**:

* Added `themeAmbienceGain` as a separate Web Audio gain connected to the master bus.
* Mixed ambience from the existing music preference at `THEME_AMBIENCE_BUS_GAIN`, so master mute and music volume control the lane without a new preference.
* Added `ActiveThemeAmbience` tracking and dispose cleanup for active ambience handles.
* Cleared pending ambience and nulled the ambience gain during dispose to avoid stale Web Audio references.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/audio.ts` - Added the low-gain ambience gain lane and cleanup lifecycle.

**Verification**:

* Command/check: `rg -n "themeAmbienceGain|THEME_AMBIENCE_BUS_GAIN|ActiveThemeAmbience|pendingThemeAmbience|playThemeAmbience|stopThemeAmbience|activeThemeAmbience" src/extensions/ai-rogue/runtime/audio.ts`
  * Result: PASS - Ambience gain, active handle, pending route, and cleanup code are present.
  * Evidence: Matches show `themeAmbienceGain` creation/connection, music-volume mix, active handle tracking, dispose stop, pending clear, and null assignment.
* Command/check: `bun run typecheck`
  * Result: PASS - TypeScript completed with exit code 0.
  * Evidence: The expanded audio interface and engine implementation compile.
* Command/check: `bun run test -- src/extensions/ai-rogue/runtime/__tests__/audio.test.ts src/extensions/ai-rogue/runtime/__tests__/themes.test.ts`
  * Result: PASS - Existing focused tests pass after adding the lane.
  * Evidence: Vitest reported 2 files passed and 16 tests passed.
* UI product-surface check: N/A - T006 changed Web Audio runtime code only.
* UI craft check: N/A - No user-facing UI changed.

**BQC Fixes**:

* Resource cleanup: Active ambience handles are stopped during dispose and pending ambience routes are cleared (`src/extensions/ai-rogue/runtime/audio.ts`).

***

### Task T007 - Add Theme Ambience Start And Stop Methods

**Started**: 2026-06-28 17:13 **Completed**: 2026-06-28 17:20 **Duration**: 7 minutes

**Notes**:

* Added `playThemeAmbience()` and `stopThemeAmbience()` to `AiRogueAudioEngine` and the silent fallback engine.
* Queued ambience requests before unlock through `pendingThemeAmbience`.
* Prevented duplicate active or pending ambience triggers for the same route.
* Used the same lazy buffer decode and no-throw `playBuffer` path as existing music/SFX, so missing Session 05 assets remain silent no-ops.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/audio.ts` - Added ambience playback and stop methods with pending-unlock, duplicate, fallback, and cleanup behavior.

**Verification**:

* Command/check: `rg -n "playThemeAmbience|stopThemeAmbience|pendingThemeAmbience|urlsForThemeAmbience|startThemeAmbience" src/extensions/ai-rogue/runtime/audio.ts`
  * Result: PASS - Playback, stop, pending, URL resolver, and start helper are present.
  * Evidence: Matches show interface methods, silent fallback methods, unlock drain, duplicate guard, stop cleanup, and URL lookup.
* Command/check: `bun run typecheck`
  * Result: PASS - TypeScript completed with exit code 0.
  * Evidence: New engine methods compile across runtime consumers.
* Command/check: `bun run test -- src/extensions/ai-rogue/runtime/__tests__/audio.test.ts src/extensions/ai-rogue/runtime/__tests__/themes.test.ts`
  * Result: PASS - Existing audio/theme tests pass before the new ambience-specific test cases are added.
  * Evidence: Vitest reported 2 files passed and 16 tests passed.
* UI product-surface check: N/A - T007 changed Web Audio runtime code only.
* UI craft check: N/A - No user-facing UI changed.

**BQC Fixes**:

* Duplicate action prevention: Same-route active and pending ambience calls return without starting another source (`src/extensions/ai-rogue/runtime/audio.ts`).
* Failure path completeness: Missing ambience URLs flow through a no-throw no-op path without fetching or throwing (`src/extensions/ai-rogue/runtime/audio.ts`).

***

### Task T008 - Document Theme Ambience Routing Contract

**Started**: 2026-06-28 17:21 **Completed**: 2026-06-28 17:22 **Duration**: 1 minute

**Notes**:

* Documented the theme ambience bus as a second low-gain lane beside primary music.
* Recorded the five stable route IDs, start/descend behavior, terminal/reset/load/destroy cleanup, silent fallback behavior, and existing preference usage.
* Documented that Session 05 owns the final optimized ambience files under `src/assets/ai-rogue/audio/music/` with the 900 KB music-loop cap.

**Files Changed**:

* `docs/extensions/ai-rogue/game-feel.md` - Added the current theme ambience routing contract and future asset target.

**Verification**:

* Command/check: `rg -n "Theme ambience|theme_cold_cache_ambience|900 KB|Session 05" docs/extensions/ai-rogue/game-feel.md`
  * Result: PASS - Routing contract and Session 05 asset target are documented.
  * Evidence: Matches show theme ambience behavior, stable IDs, and 900 KB Session 05 cap text.
* Command/check: `LC_ALL=C rg -n "[^\\x00-\\x7F]" docs/extensions/ai-rogue/game-feel.md || true`
  * Result: PASS - No non-ASCII characters found.
  * Evidence: Command produced no output.
* Command/check: `bunx prettier --check docs/extensions/ai-rogue/game-feel.md`
  * Result: PASS - Prettier accepted the document.
  * Evidence: `All matched files use Prettier code style!`
* UI product-surface check: N/A - T008 changed documentation only.
* UI craft check: N/A - No user-facing UI changed.

**BQC Fixes**:

* None. This task changed documentation only.

***

### Task T009 - Wire Renderer Audio Adapter Theme Selection

**Started**: 2026-06-28 17:14 **Completed**: 2026-06-28 17:24 **Duration**: 10 minutes

**Notes**:

* Added an injected `AiRogueThemeAmbienceResolver` so the adapter can select routes from `snapshot.theme` without statically importing audio assets.
* Added resolver error handling that maps failures to a no-throw fallback and stops stale ambience.
* Updated descend handling to play ambience only when the new snapshot theme differs from the previous theme.
* Updated terminal handling to stop ambience before victory or defeat primary music starts.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/renderer-audio-adapter.ts` - Added theme ambience resolver, no-throw fallback mapping, descend routing, and terminal cleanup.

**Verification**:

* Command/check: `rg -n "AiRogueThemeAmbienceResolver|resolveThemeAmbienceRoute|playThemeAmbienceForState|resolveThemeAmbience|previousTheme|stopThemeAmbience|playThemeAmbience" src/extensions/ai-rogue/runtime/renderer-audio-adapter.ts`
  * Result: PASS - Adapter route selection and fallback code are present.
  * Evidence: Matches show resolver type, try/catch route resolution, theme-change guard, `playThemeAmbience`, and `stopThemeAmbience` before terminal music.
* Command/check: `bun run typecheck`
  * Result: PASS - TypeScript completed with exit code 0.
  * Evidence: Adapter signature and renderer call sites compile.
* UI product-surface check: N/A - T009 changed runtime adapter code only.
* UI craft check: N/A - No user-facing UI changed.

**BQC Fixes**:

* Failure path completeness: Resolver failures and missing resolver cases map to a safe stop/no-op path instead of throwing through gameplay (`src/extensions/ai-rogue/runtime/renderer-audio-adapter.ts`).
* Contract alignment: Adapter receives the route resolver from the dynamic audio import, preserving the renderer/audio asset boundary (`src/extensions/ai-rogue/runtime/renderer-audio-adapter.ts`).

***

### Task T010 - Wire Start And Descend Theme Ambience Paths

**Started**: 2026-06-28 17:14 **Completed**: 2026-06-28 17:25 **Duration**: 11 minutes

**Notes**:

* Renderer dynamic audio import now exposes both `musicTrackForDepth` and `themeAmbienceForTheme`.
* Fresh run start still plays `run_start` and the current depth music, then starts theme ambience from the current snapshot theme.
* Command result dispatch now passes `previousTheme`, so descend can change ambience by sector without restarting it when deeper floors keep the same clamped theme.
* Depth music behavior remains routed through `resolveMusicTrack` and `playMusic` unchanged.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/renderer.ts` - Wired dynamic theme resolver, fresh-start ambience playback, and previous theme tracking.
* `src/extensions/ai-rogue/runtime/renderer-audio-adapter.ts` - Added descend ambience routing while preserving existing depth music routing.

**Verification**:

* Command/check: `rg -n "resolveThemeAmbience|playThemeAmbienceForState|previousTheme|themeAmbienceForTheme|resolveMusicTrack|playMusic\\(|start:" src/extensions/ai-rogue/runtime/renderer.ts src/extensions/ai-rogue/runtime/renderer-audio-adapter.ts`
  * Result: PASS - Start and descend routing code is present.
  * Evidence: Matches show dynamic resolver assignment, fresh-start `playThemeAmbienceForState`, previous theme capture, and existing depth `playMusic(resolveMusicTrack(...))`.
* Command/check: `bun run typecheck`
  * Result: PASS - TypeScript completed with exit code 0.
  * Evidence: Renderer resolver wiring compiles.
* UI product-surface check: N/A - T010 changed runtime audio behavior only; no visible UI route/component changed.
* UI craft check: N/A - No user-facing UI changed.

**BQC Fixes**:

* State freshness on re-entry: Fresh start resolves ambience from the current `state.runSnapshot.theme`, including saved/load-created snapshots (`src/extensions/ai-rogue/runtime/renderer.ts`).
* Duplicate action prevention: Descend compares the new snapshot theme to `previousTheme` before calling the ambience route (`src/extensions/ai-rogue/runtime/renderer-audio-adapter.ts`).

***

### Task T011 - Wire Terminal Reset Load And Destroy Cleanup

**Started**: 2026-06-28 17:15 **Completed**: 2026-06-28 17:26 **Duration**: 11 minutes

**Notes**:

* Victory and defeat result handling now stops theme ambience before switching the primary music lane to terminal music.
* Reset and load controller paths stop theme ambience alongside existing primary music and heartbeat cleanup.
* Destroy and mount-failure cleanup dispose the engine and clear audio route resolver references.
* Engine dispose stops active ambience handles and clears pending ambience routes.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/renderer-audio-adapter.ts` - Stops ambience before victory and defeat music.
* `src/extensions/ai-rogue/runtime/renderer.ts` - Stops ambience on reset/load and clears audio resolvers on destroy/failure cleanup.
* `src/extensions/ai-rogue/runtime/audio.ts` - Disposes active ambience and pending ambience routes.

**Verification**:

* Command/check: `rg -n "stopThemeAmbience|destroy:|reset:|load:|resolveThemeAmbience = null|activeThemeAmbience|pendingThemeAmbience" src/extensions/ai-rogue/runtime/renderer.ts src/extensions/ai-rogue/runtime/renderer-audio-adapter.ts src/extensions/ai-rogue/runtime/audio.ts`
  * Result: PASS - Terminal, reset, load, destroy, and engine cleanup calls are present.
  * Evidence: Matches show terminal `stopThemeAmbience`, reset/load `stopThemeAmbience`, resolver nulling, active ambience stop, and pending ambience clear.
* Command/check: `bun run typecheck`
  * Result: PASS - TypeScript completed with exit code 0.
  * Evidence: Cleanup wiring compiles.
* UI product-surface check: N/A - T011 changed runtime audio cleanup only; no visible UI route/component changed.
* UI craft check: N/A - No user-facing UI changed.

**BQC Fixes**:

* Resource cleanup: Terminal, reset, load, destroy, and dispose paths now release or clear theme ambience resources (`src/extensions/ai-rogue/runtime/audio.ts`, `src/extensions/ai-rogue/runtime/renderer.ts`, `src/extensions/ai-rogue/runtime/renderer-audio-adapter.ts`).
* State freshness on re-entry: Reset/load stop stale ambience before a future start reselects from the current snapshot theme (`src/extensions/ai-rogue/runtime/renderer.ts`).

***

### Task T012 - Preserve Existing Mute And Music Volume Behavior

**Started**: 2026-06-28 17:15 **Completed**: 2026-06-28 17:27 **Duration**: 12 minutes

**Notes**:

* Theme ambience lane is mixed through the existing master gain and uses existing `musicVolume` scaled by `THEME_AMBIENCE_BUS_GAIN`.
* No new ambience preference, Settings UI control, save-schema field, dependency, or lockfile change was added.
* Renderer preference updates continue to call `audio.setPreferences(audioPreferences(state))`, so ambience inherits existing mute/music changes with primary music.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/audio.ts` - Mixed theme ambience from existing master mute and music volume.
* `src/extensions/ai-rogue/runtime/renderer.ts` - Preserved existing preference update path.

**Verification**:

* Command/check: `rg -n "masterVolume|musicVolume|themeAmbienceGain|THEME_AMBIENCE_BUS_GAIN|updatePreferences|audioMuted|stopThemeAmbience" src/extensions/ai-rogue/runtime/audio.ts src/extensions/ai-rogue/runtime/renderer.ts src/extensions/ai-rogue/runtime/renderer-audio-adapter.ts src/extensions/ai-rogue/save-schema.ts src/extensions/ai-rogue/views`
  * Result: PASS - Ambience uses existing music preference; save schema and Settings retain only existing audio fields.
  * Evidence: Matches show `themeAmbienceGain` receives `preferences.musicVolume * THEME_AMBIENCE_BUS_GAIN`; save schema has `audioMuted`, `musicVolume`, and `sfxVolume` only.
* Command/check: `git diff -- package.json bun.lock src/extensions/ai-rogue/save-schema.ts src/extensions/ai-rogue/views src/routes | cat`
  * Result: PASS - No dependency, lockfile, schema, Settings UI, or route changes were made.
  * Evidence: Command produced no output.
* Command/check: `bun run typecheck`
  * Result: PASS - TypeScript completed with exit code 0.
  * Evidence: Existing preference contracts compile.
* UI product-surface check: PASS - No user-facing route/component files changed for this task; Settings UI remains unchanged.
* UI craft check: N/A - No UI layout or interaction changed.

**BQC Fixes**:

* Contract alignment: Ambience follows the existing audio preference contract without schema drift or a new persisted field (`src/extensions/ai-rogue/runtime/audio.ts`).

***

### Task T013 - Update Media Policy And Phase Stub

**Started**: 2026-06-28 17:28 **Completed**: 2026-06-28 17:30 **Duration**: 2 minutes

**Notes**:

* Updated media policy so AI Rogue theme ambience loops use the music workflow, `audio/music/` location, and 900 KB music cap.
* Updated the Phase 36 Session 04 stub from a decision-to-make state to the selected low-gain ambience lane contract.
* Kept final ambience loop files explicitly assigned to Session 05 and documented as not shipped in this session.

**Files Changed**:

* `docs/media-policy.md` - Added theme ambience format, workflow, and asset organization guidance.
* `.spec_system/PRD/phase_36/session_04_theme_audio_routing_contract.md` - Marked the contract decision current and preserved Session 05 asset ownership.

**Verification**:

* Command/check: `rg -n "Game theme ambience|theme ambience loops|Current Routing Decision|theme_cold_cache_ambience|Session 05|Status" docs/media-policy.md .spec_system/PRD/phase_36/session_04_theme_audio_routing_contract.md`
  * Result: PASS - Media policy and session stub now describe the selected contract and future asset ownership.
  * Evidence: Matches show the ambience media row, `audio/music/` guidance, current routing decision, route IDs, and Session 05 not-shipped language.
* Command/check: `LC_ALL=C rg -n "[^\\x00-\\x7F]" docs/media-policy.md .spec_system/PRD/phase_36/session_04_theme_audio_routing_contract.md || true`
  * Result: PASS - No non-ASCII characters found.
  * Evidence: Command produced no output.
* Command/check: `bunx prettier --check docs/media-policy.md .spec_system/PRD/phase_36/session_04_theme_audio_routing_contract.md`
  * Result: PASS - Prettier accepted both documents.
  * Evidence: `All matched files use Prettier code style!`
* UI product-surface check: N/A - T013 changed documentation only.
* UI craft check: N/A - No user-facing UI changed.

**BQC Fixes**:

* None. This task changed documentation only.

***

### Task T014 - Add Focused Audio Engine Ambience Tests

**Started**: 2026-06-28 17:31 **Completed**: 2026-06-28 17:35 **Duration**: 4 minutes

**Notes**:

* Expanded the fake Web Audio harness to expose gain nodes and source loop state.
* Added ambience tests for route playback, pending unlock, duplicate in-flight no-op, stop-before-decode cleanup, dispose cleanup, mute/music volume mix, missing URL fallback, and decode failure cleanup.
* Used the test-only ambience URL hook so no final Session 05 audio files are required or committed.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/__tests__/audio.test.ts` - Added focused theme ambience coverage and harness gain/source assertions.

**Verification**:

* Command/check: `rg -n "theme ambience|playThemeAmbience|stopThemeAmbience|master mute|missing|decode" src/extensions/ai-rogue/runtime/__tests__/audio.test.ts`
  * Result: PASS - New ambience test coverage is present.
  * Evidence: Matches show playback, pending unlock, duplicate, stop, dispose, volume, missing URL, and decode failure cases.
* Command/check: `bun run test -- src/extensions/ai-rogue/runtime/__tests__/audio.test.ts`
  * Result: PASS - Focused audio test suite passed.
  * Evidence: Vitest reported 1 file passed and 20 tests passed.
* Command/check: `LC_ALL=C rg -n "[^\\x00-\\x7F]" src/extensions/ai-rogue/runtime/__tests__/audio.test.ts || true`
  * Result: PASS - No non-ASCII characters found.
  * Evidence: Command produced no output.
* UI product-surface check: N/A - T014 changed tests only.
* UI craft check: N/A - No user-facing UI changed.

**BQC Fixes**:

* Resource cleanup: Added tests for stop-before-decode and dispose cleanup of ambience handles (`src/extensions/ai-rogue/runtime/__tests__/audio.test.ts`).
* Duplicate action prevention: Added a duplicate in-flight ambience start test (`src/extensions/ai-rogue/runtime/__tests__/audio.test.ts`).
* Failure path completeness: Added missing URL and decode failure tests (`src/extensions/ai-rogue/runtime/__tests__/audio.test.ts`).

***

### Task T015 - Add Renderer Audio Adapter Tests

**Started**: 2026-06-28 17:36 **Completed**: 2026-06-28 17:37 **Duration**: 1 minute

**Notes**:

* Added adapter tests for start theme selection, descend theme changes, same-theme descend no-op, victory/defeat ambience stop ordering, and resolver failure fallback.
* Verified depth music routing still calls `playMusic(resolveMusicTrack(depth))` during descend.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/__tests__/renderer-audio-adapter.test.ts` - Created focused adapter coverage for theme ambience routing.

**Verification**:

* Command/check: `rg -n "starts theme ambience|changes theme ambience|same theme|victory and defeat|resolver failures|playThemeAmbience|stopThemeAmbience" src/extensions/ai-rogue/runtime/__tests__/renderer-audio-adapter.test.ts`
  * Result: PASS - Required adapter scenarios are present.
  * Evidence: Matches show start, descend, unchanged-theme no-op, terminal stop, resolver fallback, and play/stop assertions.
* Command/check: `bun run test -- src/extensions/ai-rogue/runtime/__tests__/renderer-audio-adapter.test.ts`
  * Result: PASS - Focused adapter tests passed.
  * Evidence: Vitest reported 1 file passed and 5 tests passed.
* Command/check: `LC_ALL=C rg -n "[^\\x00-\\x7F]" src/extensions/ai-rogue/runtime/__tests__/renderer-audio-adapter.test.ts || true`
  * Result: PASS - No non-ASCII characters found.
  * Evidence: Command produced no output.
* UI product-surface check: N/A - T015 changed tests only.
* UI craft check: N/A - No user-facing UI changed.

**BQC Fixes**:

* Contract alignment: Added tests proving adapter route selection and depth music routing remain aligned (`src/extensions/ai-rogue/runtime/__tests__/renderer-audio-adapter.test.ts`).
* Failure path completeness: Added a resolver-failure fallback test (`src/extensions/ai-rogue/runtime/__tests__/renderer-audio-adapter.test.ts`).

***

### Task T016 - Add Theme Mapping Test

**Started**: 2026-06-28 17:36 **Completed**: 2026-06-28 17:37 **Duration**: 1 minute

**Notes**:

* Added a focused test that iterates every `AI_ROGUE_THEME_ORDER` entry.
* Verified `themeAmbienceForTheme(themeId)` matches the sector theme `audioHint`.
* Verified every route has a stable future basename and no two sector themes collapse to the same route.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/__tests__/themes.test.ts` - Added stable ambience route coverage for all sector themes.

**Verification**:

* Command/check: `rg -n "stable ambience route|themeAmbienceForTheme|AI_ROGUE_THEME_AMBIENCE_FILE_BASENAMES|audioHint" src/extensions/ai-rogue/runtime/__tests__/themes.test.ts`
  * Result: PASS - Theme mapping assertions are present.
  * Evidence: Matches show the ambience resolver, basename map, `audioHint` alignment, and stable-route test.
* Command/check: `bun run test -- src/extensions/ai-rogue/runtime/__tests__/themes.test.ts`
  * Result: PASS - Focused theme tests passed.
  * Evidence: Vitest reported 1 file passed and 5 tests passed.
* Command/check: `LC_ALL=C rg -n "[^\\x00-\\x7F]" src/extensions/ai-rogue/runtime/__tests__/themes.test.ts || true`
  * Result: PASS - No non-ASCII characters found.
  * Evidence: Command produced no output.
* UI product-surface check: N/A - T016 changed tests only.
* UI craft check: N/A - No user-facing UI changed.

**BQC Fixes**:

* Contract alignment: Added coverage ensuring theme metadata, resolver output, and future basenames stay synchronized (`src/extensions/ai-rogue/runtime/__tests__/themes.test.ts`).

***

### Task T017 - Run Focused Tests And TypeScript Validation

**Started**: 2026-06-28 17:37 **Completed**: 2026-06-28 17:37 **Duration**: 1 minute

**Notes**:

* Ran the combined focused AI Rogue audio, renderer audio adapter, and theme mapping test suite.
* Ran the app TypeScript validation after all runtime and test changes.

**Files Changed**:

* `.spec_system/specs/phase36-session04-theme-audio-routing-contract/implementation-notes.md` - Recorded command evidence.

**Verification**:

* Command/check: `bun run test -- src/extensions/ai-rogue/runtime/__tests__/audio.test.ts src/extensions/ai-rogue/runtime/__tests__/renderer-audio-adapter.test.ts src/extensions/ai-rogue/runtime/__tests__/themes.test.ts`
  * Result: PASS - Focused AI Rogue audio/theme/adapter tests passed.
  * Evidence: Vitest reported 3 files passed and 30 tests passed.
* Command/check: `bun run typecheck`
  * Result: PASS - App TypeScript validation passed.
  * Evidence: `tsc --noEmit` completed with exit code 0.
* UI product-surface check: N/A - T017 changed only session notes.
* UI craft check: N/A - No user-facing UI changed.

**BQC Fixes**:

* None. This task executed validation commands only.

***

### Task T018 - Run Asset-Size Validation And Confirm No Theme Assets

**Started**: 2026-06-28 17:37 **Completed**: 2026-06-28 17:37 **Duration**: 1 minute

**Notes**:

* Ran the repository asset-size checker.
* Confirmed no final Session 05 theme ambience files were added under `src/assets/ai-rogue/audio/music/`.
* Confirmed there are no tracked/untracked audio asset changes in `src/assets/ai-rogue/audio`.

**Files Changed**:

* `.spec_system/specs/phase36-session04-theme-audio-routing-contract/implementation-notes.md` - Recorded asset validation evidence.

**Verification**:

* Command/check: `bash scripts/check-asset-sizes.sh`
  * Result: PASS - Asset-size validation passed.
  * Evidence: Script printed `OK: All assets within configured size limits (total: 14M)`.
* Command/check: `git status --short src/assets/ai-rogue/audio && rg --files src/assets/ai-rogue/audio/music | sort && rg -n "theme_(cold_cache|corrupted_index|kernel_core|firewall|model_vault)_ambience" src/assets/ai-rogue/audio || true`
  * Result: PASS - No audio asset changes and no final theme ambience files were found.
  * Evidence: Music folder lists only `01_title_menu_loop.ogg` through `06_defeat_core_dump_after_midnight.ogg` plus `provenance.json`; no `theme_*_ambience` matches were found in assets.
* UI product-surface check: N/A - T018 changed only session notes.
* UI craft check: N/A - No user-facing UI changed.

**BQC Fixes**:

* None. This task executed asset validation only.

***

### Task T019 - Complete Runtime Browser Verification

**Started**: 2026-06-28 17:37 **Completed**: 2026-06-28 17:37 **Duration**: 1 minute

**Notes**:

* Extended the existing hidden browser audio proof to exercise theme ambience start, descend route change, terminal stop, and silent fallback in the normal AI Rogue Play route.
* Kept proof instrumentation inside the test harness; no visible product UI diagnostics or debug panels were added.
* Initial full Chromium run failed because the desktop proof used fixed sleeps and read the source-start counter before async fetch/decode/start completed. Added an in-page polling helper and reran the desktop proof successfully, then reran the full spec successfully.

**Files Changed**:

* `tests/e2e/ai-rogue-runtime.spec.ts` - Added browser proof assertions for theme ambience fetch/start and polling around async Web Audio startup.
* `.spec_system/specs/phase36-session04-theme-audio-routing-contract/implementation-notes.md` - Recorded runtime verification evidence.

**Verification**:

* Command/check: `bunx playwright test tests/e2e/ai-rogue-runtime.spec.ts --project=chromium -g "theme audio on desktop"`
  * Result: PASS - Focused desktop audio proof passed after polling fix.
  * Evidence: Playwright reported 1 passed.
* Command/check: `bunx playwright test tests/e2e/ai-rogue-runtime.spec.ts --project=chromium`
  * Result: PASS - Full AI Rogue runtime browser spec passed.
  * Evidence: Playwright reported 11 passed.
* Command/check: `rg -n "theme audio|themeSourceStarts|themeUrls|__setAiRogueThemeAmbienceUrlsForTests|waitForProof|pageErrors|failedRequests" tests/e2e/ai-rogue-runtime.spec.ts`
  * Result: PASS - Browser proof includes theme ambience fetch/start checks and page error/request failure assertions.
  * Evidence: Matches show theme URL/source assertions, hidden test URL hook, polling helper, and `pageErrors`/`failedRequests` expectations.
* Command/check: `LC_ALL=C rg -n "[^\\x00-\\x7F]" tests/e2e/ai-rogue-runtime.spec.ts || true`
  * Result: PASS - No non-ASCII characters found.
  * Evidence: Command produced no output.
* Command/check: `bunx prettier --check tests/e2e/ai-rogue-runtime.spec.ts`
  * Result: PASS - Prettier accepted the Playwright spec.
  * Evidence: `All matched files use Prettier code style!`
* UI product-surface check: PASS - Browser verification ran against `/extensions/ai-rogue/play` on desktop and mobile with normal product UI; page errors and non-data failed requests were empty.
* UI craft check: PASS - Existing runtime Playwright checks confirmed canvas paint, input, save/reset/load, combat feedback, product scenario query handling, and remount cleanup across the normal Play route.

**BQC Fixes**:

* Failure path completeness: Browser proof now waits for async theme ambience fetch/decode/start rather than relying on fixed sleeps (`tests/e2e/ai-rogue-runtime.spec.ts`).
* Product surface discipline: Theme audio proof remains hidden in test harness code and does not add visible runtime diagnostics (`tests/e2e/ai-rogue-runtime.spec.ts`).

***

## Final Verification

* `bun run lint` - PASS - ESLint completed with exit code 0 after Prettier fixes.
* `bun run typecheck` - PASS - `tsc --noEmit` completed with exit code 0.
* `bun run test` - PASS - Vitest reported 384 files passed and 4393 tests passed.
* `bun run test -- src/extensions/ai-rogue/runtime/__tests__/audio.test.ts src/extensions/ai-rogue/runtime/__tests__/renderer-audio-adapter.test.ts src/extensions/ai-rogue/runtime/__tests__/themes.test.ts` - PASS - Focused suite reported 3 files passed and 30 tests passed.
* `bunx playwright test tests/e2e/ai-rogue-runtime.spec.ts --project=chromium` - PASS - Playwright reported 11 tests passed.
* `bash scripts/check-asset-sizes.sh` - PASS - Asset-size script reported all assets within configured limits.
* `git diff --check HEAD` - PASS - No whitespace errors.
* `bunx prettier --check [touched files]` - PASS - All matched files use Prettier code style.
* `LC_ALL=C rg -n "[^\\x00-\\x7F]" [touched files] || true` - PASS - No non-ASCII characters found.

***

## Design Decisions

### Decision 1: Theme Audio Uses A Low-Gain Ambience Lane

**Context**: Phase 36 needed theme-aware audio keyed by `snapshot.theme` without disrupting the already validated depth/title/victory/defeat music lane.

**Options Considered**:

1. Five replacement theme music loops - Clear theme identity but higher media cost and higher risk to existing music behavior.
2. Existing depth music plus five low-gain ambience beds - Adds sector identity while preserving current run-arc music.

**Chosen**: Existing depth music plus a second low-gain theme ambience lane.

**Rationale**: This satisfies the `snapshot.theme` routing requirement while preserving current depth, title, victory, defeat, mute, volume, unlock, and silent fallback behavior.

### Decision 2: Test Ambience URLs Use A Test Hook

**Context**: Session 04 must prove ambience playback behavior without committing the final Session 05 audio files.

**Options Considered**:

1. Commit placeholder audio files - Would blur the Session 05 asset boundary.
2. Use a test-only URL override hook - Lets tests exercise playback paths without shipping assets.

**Chosen**: Add `__setAiRogueThemeAmbienceUrlsForTests()`.

**Rationale**: The runtime remains local-asset-first, no final theme assets are committed, and unit/browser tests can still cover fetch/decode/start/stop behavior.

***

## Blockers & Solutions

No blockers.


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