> 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/phase39-session04-existing-media-floor-four/implementation-notes.md).

# Implementation Notes

**Session ID**: `phase39-session04-existing-media-floor-four` **Started**: 2026-06-30 20:52 **Last Updated**: 2026-06-30 21:13

***

## Session Progress

| Metric              | Value   |
| ------------------- | ------- |
| Tasks Completed     | 16 / 16 |
| Estimated Remaining | 0 hours |
| Blockers            | 0       |

***

### Task T016 - Validate ASCII and LF requirements

**Started**: 2026-06-30 21:12 **Completed**: 2026-06-30 21:13 **Duration**: 1 minute

**Notes**:

* Checked touched session artifacts and AI Rogue source/test files for non-ASCII characters.
* Checked the same files for CRLF line endings.

**Files Changed**:

* `.spec_system/specs/phase39-session04-existing-media-floor-four/implementation-notes.md` - recorded hygiene check evidence.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/tasks.md` - marked T016 complete and updated completion checklist.

**Verification**:

* Command/check: `grep -nP '[^\\x00-\\x7F]' "${files[@]}"`
  * Result: PASS - no non-ASCII characters found in touched files.
  * Evidence: command reported `ASCII: PASS (12 files)`.
* Command/check: `grep -n $'\\r' "${files[@]}"`
  * Result: PASS - no CRLF line endings found in touched files.
  * Evidence: command reported `LF: PASS (12 files)`.
* UI product-surface check: N/A - file hygiene validation only; no route or visual surface changed.
* UI craft check: N/A - no UI changed.
* BQC Fixes: N/A - hygiene checks passed.

***

### Task T015 - Run typecheck and save-schema parity

**Started**: 2026-06-30 21:11 **Completed**: 2026-06-30 21:12 **Duration**: 1 minute

**Notes**:

* Ran full TypeScript typecheck.
* Ran save-schema parity to prove runtime IDs remain covered by parser-owned persisted IDs.

**Files Changed**:

* `.spec_system/specs/phase39-session04-existing-media-floor-four/implementation-notes.md` - recorded typecheck and parity evidence.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/tasks.md` - marked T015 complete.

**Verification**:

* Command/check: `bun run typecheck`
  * Result: PASS - TypeScript accepted the implementation.
  * Evidence: `tsc --noEmit` completed with exit code 0.
* Command/check: `bunx vitest run src/extensions/ai-rogue/__tests__/save-schema-parity.test.ts`
  * Result: PASS - save-schema parity suite passed.
  * Evidence: 1 test file passed, 12 tests passed.
* UI product-surface check: N/A - validation commands only; no route or visual surface changed.
* UI craft check: N/A - no UI changed.
* BQC Fixes: N/A - type and parser-contract checks passed.

***

### Task T014 - Run focused runtime, objective, golden, and save suites

**Started**: 2026-06-30 21:11 **Completed**: 2026-06-30 21:11 **Duration**: 0 minutes

**Notes**:

* Ran the grouped runtime, objective, golden, final-presentation, and save-schema validation command from the task checklist.

**Files Changed**:

* `.spec_system/specs/phase39-session04-existing-media-floor-four/implementation-notes.md` - recorded grouped runtime validation evidence.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/tasks.md` - marked T014 complete.

**Verification**:

* Command/check: `bunx vitest run src/extensions/ai-rogue/runtime/__tests__/world.test.ts src/extensions/ai-rogue/runtime/__tests__/golden-determinism.test.ts src/extensions/ai-rogue/runtime/__tests__/roguelike-loop.test.ts src/extensions/ai-rogue/runtime/__tests__/objective-lock.test.ts src/extensions/ai-rogue/runtime/__tests__/biome-final.test.ts src/extensions/ai-rogue/__tests__/save-schema.test.ts`
  * Result: PASS - focused runtime/objective/golden/save suites passed.
  * Evidence: 6 test files passed, 47 tests passed.
* UI product-surface check: N/A - validation command only; no route or visual surface changed.
* UI craft check: N/A - no UI changed.
* BQC Fixes: N/A - grouped runtime checks passed.

***

### Task T013 - Run focused content and resolver suites

**Started**: 2026-06-30 21:10 **Completed**: 2026-06-30 21:11 **Duration**: 1 minute

**Notes**:

* Ran the grouped content and resolver validation command from the task checklist.

**Files Changed**:

* `.spec_system/specs/phase39-session04-existing-media-floor-four/implementation-notes.md` - recorded grouped validation evidence.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/tasks.md` - marked T013 complete.

**Verification**:

* Command/check: `bunx vitest run src/extensions/ai-rogue/runtime/content/__tests__/levels.test.ts src/extensions/ai-rogue/runtime/__tests__/content-baseline.test.ts src/extensions/ai-rogue/runtime/__tests__/depth-resolver.test.ts`
  * Result: PASS - focused content and resolver suites passed.
  * Evidence: 3 test files passed, 12 tests passed.
* UI product-surface check: N/A - validation command only; no route or visual surface changed.
* UI craft check: N/A - no UI changed.
* BQC Fixes: N/A - grouped contract checks passed.

***

### Task T012 - Keep final presentation tests explicit after max-depth moves to 4

**Started**: 2026-06-30 21:09 **Completed**: 2026-06-30 21:10 **Duration**: 1 minute

**Notes**:

* Updated authored final-defense fixtures to run at `AI_ROGUE_MAX_DEPTH` depth 4.
* Kept Kernel Core boss presentation coverage as an explicit crafted depth-3 finality fixture with `maxDepth: 3`.
* Added assertions that authored max depth is 4 while the Kernel Core presentation test is intentionally crafted at depth 3.
* Did not add renderer, audio, route, or branch logic.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/__tests__/biome-final.test.ts` - made final-depth fixture ownership explicit after authored max depth moved to 4.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/implementation-notes.md` - recorded final presentation test evidence.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/tasks.md` - marked T012 complete.

**Verification**:

* Command/check: `bunx vitest run src/extensions/ai-rogue/runtime/__tests__/biome-final.test.ts`
  * Result: PASS - final presentation tests remain green with explicit depth-4 authored final fixtures and crafted depth-3 Kernel Core coverage.
  * Evidence: 1 test file passed, 6 tests passed.
* UI product-surface check: N/A - tests only; no route or visual component changed.
* UI craft check: N/A - no UI changed.
* BQC Fixes: N/A - contract-alignment test coverage updated; no runtime UI or renderer branch changed.

***

### Task T011 - Add durable depth-4 save parse and hydration coverage

**Started**: 2026-06-30 21:08 **Completed**: 2026-06-30 21:09 **Duration**: 1 minute

**Notes**:

* Added a durable snapshot round-trip test for a generated depth-4 run.
* Verified schema version remains `1`.
* Verified depth-4 reused IDs parse through existing save schemas: `firewall`, `kernel-sentinel`, `trace-lance`, `phase-step`, and terminal tile state.
* Verified durable snapshot hydration and saved-run hydration preserve depth 4 and max depth 4.

**Files Changed**:

* `src/extensions/ai-rogue/__tests__/save-schema.test.ts` - added depth-4 durable parse and hydration coverage.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/implementation-notes.md` - recorded save-schema test evidence.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/tasks.md` - marked T011 complete.

**Verification**:

* Command/check: `bunx vitest run src/extensions/ai-rogue/__tests__/save-schema.test.ts`
  * Result: PASS - save-schema suite accepts the depth-4 durable snapshot without a version bump.
  * Evidence: 1 test file passed, 14 tests passed.
* UI product-surface check: N/A - save-schema tests only; no route or visual surface changed.
* UI craft check: N/A - no UI changed.
* BQC Fixes: Contract alignment - added parser/hydration coverage for depth-4 runtime shape and reused persisted IDs.

***

### Task T010 - Add depth-4 objective-lock coverage

**Started**: 2026-06-30 21:06 **Completed**: 2026-06-30 21:08 **Duration**: 2 minutes

**Notes**:

* Added catalog coverage proving depth 4 owns the purge-dumps objective.
* Added descent/re-entry coverage proving a fresh depth-4 floor resets objective progress to zero.
* Added final-floor unlock coverage proving depth 4 can purge the required dump, release the exit lock, and win.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/__tests__/objective-lock.test.ts` - added depth-4 objective, reset, unlock, and final-win assertions.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/implementation-notes.md` - recorded objective-lock test evidence.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/tasks.md` - marked T010 complete.

**Verification**:

* Command/check: `bunx vitest run src/extensions/ai-rogue/runtime/__tests__/objective-lock.test.ts`
  * Result: PASS - objective-lock tests cover depth-4 lock ownership, reset on descent, unlock, and victory.
  * Evidence: 1 test file passed, 8 tests passed.
* UI product-surface check: N/A - runtime objective tests only; no route or visual surface changed.
* UI craft check: N/A - no UI changed.
* BQC Fixes: State freshness on re-entry - added descent coverage proving the depth-4 objective is reinitialized when the floor is entered.

***

### Task T009 - Update run-loop max-depth and finality tests

**Started**: 2026-06-30 21:04 **Completed**: 2026-06-30 21:06 **Duration**: 2 minutes

**Notes**:

* Updated descent test setup to use `AI_ROGUE_MAX_DEPTH`.
* Added explicit proof that a depth-3 exit descends into authored depth 4 and lands on the firewall theme.
* Updated final-floor win coverage to depth 4.
* Added duplicate-trigger-safe command sequencing coverage by applying another command after the win and expecting a `noop`.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/__tests__/roguelike-loop.test.ts` - updated descent, finality, and post-win command assertions.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/implementation-notes.md` - recorded run-loop test evidence.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/tasks.md` - marked T009 complete.

**Verification**:

* Command/check: `bunx vitest run src/extensions/ai-rogue/runtime/__tests__/roguelike-loop.test.ts`
  * Result: PASS - run-loop tests accept max depth 4, depth-3 descent, depth-4 victory, and post-win noop behavior.
  * Evidence: 1 test file passed, 8 tests passed.
* UI product-surface check: N/A - runtime tests only; no route or visual surface changed.
* UI craft check: N/A - no UI changed.
* BQC Fixes: Duplicate action prevention - added post-win command assertion to ensure repeated commands after victory resolve to `noop` instead of triggering another win or descent.

***

### Task T008 - Extend golden determinism to depth 4

**Started**: 2026-06-30 21:00 **Completed**: 2026-06-30 21:04 **Duration**: 4 minutes

**Notes**:

* Extended golden depth list from `[1, 2, 3]` to `[1, 2, 3, 4]`.
* Switched first-turn golden runs to use `AI_ROGUE_MAX_DEPTH` so the expected max depth follows authored content.
* Added the depth-4 firewall world summary and first-turn run summary with deterministic ordering.
* Updated existing first-turn max-depth expectations from 3 to 4 without changing depth 1-3 world-shape expectations.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/__tests__/golden-determinism.test.ts` - added depth-4 deterministic world and first-turn run expectations.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/implementation-notes.md` - recorded golden determinism evidence.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/tasks.md` - marked T008 complete.

**Verification**:

* Command/check: `bun - <<'EOF' ... EOF`
  * Result: PASS - generated deterministic summaries for depths 1-4 from current runtime helpers.
  * Evidence: output showed depth-4 theme `firewall`, tile counts including 16 hazards, `kernel-sentinel` guard at `27,12`, product-safe event copy, and first-turn maxDepth `4`.
* Command/check: `bunx vitest run src/extensions/ai-rogue/runtime/__tests__/golden-determinism.test.ts`
  * Result: PASS - golden expected constants match deterministic runtime output.
  * Evidence: 1 test file passed, 2 tests passed.
* UI product-surface check: N/A - runtime deterministic tests only; no route or visual surface changed.
* UI craft check: N/A - no UI changed.
* BQC Fixes: N/A - contract-alignment golden coverage updated and passed.

***

### Task T007 - Extend generated-world route-safety coverage to depth 4

**Started**: 2026-06-30 20:59 **Completed**: 2026-06-30 21:00 **Duration**: 1 minute

**Notes**:

* Added depth 4 to the authored generated-floor route-safety matrix.
* Added no-overlap checks for enemy and pickup spawn positions against each other, start, and exit.
* Added hazard-cache prefab signature coverage for the depth-4 context cache surrounded by hazard tiles.
* Updated the final authored shrine/guard check to use depth 4.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/__tests__/world.test.ts` - added depth-4 route-safety, no-overlap, and hazard-cache assertions.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/implementation-notes.md` - recorded world test evidence.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/tasks.md` - marked T007 complete.

**Verification**:

* Command/check: `bunx vitest run src/extensions/ai-rogue/runtime/__tests__/world.test.ts`
  * Result: PASS - generated-world route-safety coverage accepts the authored fourth floor.
  * Evidence: 1 test file passed, 9 tests passed.
* UI product-surface check: N/A - runtime world tests only; no route or visual surface changed.
* UI craft check: N/A - no UI changed.
* BQC Fixes: N/A - contract-alignment and failure-path relevant assertions were added; no runtime code changed in this task.

***

### Task T006 - Update depth resolver tests

**Started**: 2026-06-30 20:58 **Completed**: 2026-06-30 20:59 **Duration**: 1 minute

**Notes**:

* Updated resolver depth list to `[1, 2, 3, 4]`.
* Changed non-authored lookup coverage from depth 4 to depth 5.
* Shifted legacy direct-helper fallback assertions to depth 5 for theme, floor arc, prefab, terminal, protocol rotation, and music fallback.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/__tests__/depth-resolver.test.ts` - updated authored-depth and legacy fallback assertions.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/implementation-notes.md` - recorded resolver test evidence.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/tasks.md` - marked T006 complete.

**Verification**:

* Command/check: `bunx vitest run src/extensions/ai-rogue/runtime/__tests__/depth-resolver.test.ts`
  * Result: PASS - resolver coverage accepts authored depth 4 and first non-authored depth 5 fallback.
  * Evidence: 1 test file passed, 4 tests passed.
* UI product-surface check: N/A - resolver tests only; no route or visual surface changed.
* UI craft check: N/A - no UI changed.
* BQC Fixes: N/A - contract-alignment coverage updated and passed.

***

### Task T005 - Update current playable content baseline

**Started**: 2026-06-30 20:57 **Completed**: 2026-06-30 20:58 **Duration**: 1 minute

**Notes**:

* Added depth 4 to the current playable content baseline table.
* Updated max-depth expectation from 3 to 4.
* Covered depth-4 helper routing for theme, arc label, baseline protocol, guaranteed protocol, terminal, prefab, music, ambience, objective, lesson copy, and generated run max depth.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/__tests__/content-baseline.test.ts` - extended baseline expectations to the authored fourth floor.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/implementation-notes.md` - recorded baseline test evidence.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/tasks.md` - marked T005 complete.

**Verification**:

* Command/check: `bunx vitest run src/extensions/ai-rogue/runtime/__tests__/content-baseline.test.ts`
  * Result: PASS - current playable content baseline accepts the depth-4 authored floor.
  * Evidence: 1 test file passed, 2 tests passed.
* UI product-surface check: N/A - runtime baseline tests only; no route or visual surface changed.
* UI craft check: N/A - no UI changed.
* BQC Fixes: N/A - contract-alignment expectations were expanded and passed.

***

### Task T004 - Update registry tests for depth 4

**Started**: 2026-06-30 20:57 **Completed**: 2026-06-30 20:57 **Duration**: 0 minutes

**Notes**:

* Updated registry expectations from three authored levels to four.
* Added explicit `firewall-gauntlet` assertions for the reused firewall generation profile, placements, enemy table, objective, guarantees, and finale metadata.
* Updated depth 3 assertions to prove it keeps its objective but no longer owns final-authored metadata.
* Moved final-level validator mutation cases to index 3 and changed out-of-range lookup coverage from depth 4 to depth 5.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/content/__tests__/levels.test.ts` - updated authored-depth, reused-media, finale, and out-of-range assertions.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/implementation-notes.md` - recorded test update evidence.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/tasks.md` - marked T004 complete.

**Verification**:

* Command/check: `bunx vitest run src/extensions/ai-rogue/runtime/content/__tests__/levels.test.ts`
  * Result: PASS - registry suite accepts the depth-4 authored content contract.
  * Evidence: 1 test file passed, 6 tests passed.
* UI product-surface check: N/A - registry tests only; no route or visual surface changed.
* UI craft check: N/A - no UI changed.
* BQC Fixes: N/A - contract-alignment tests were updated and passed; no lifecycle or UI code changed.

***

### Task T003 - Append depth-4 firewall-gauntlet level spec

**Started**: 2026-06-30 20:55 **Completed**: 2026-06-30 20:57 **Duration**: 2 minutes

**Notes**:

* Added the authored `firewall-gauntlet` depth-4 `AiRogueLevelSpec`.
* Reused existing IDs only: `firewall`, `threat-dense`, `trace-lance`, `sector_3`, `theme_firewall_ambience`, `kernel-sentinel`, `patch-mirror`, `hazard-cache`, `phase-step`, `venom-daemon`, and `purge-dumps`.
* Moved final-authored metadata from depth 3 to depth 4 while preserving depth 3 generation, guard, objective, and route behavior fields.
* Kept save-schema version and persisted ID arrays unchanged.

**Files Changed**:

* `src/extensions/ai-rogue/runtime/content/levels.ts` - appended depth-4 level spec and moved finale ownership.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/implementation-notes.md` - recorded implementation evidence.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/tasks.md` - marked T003 complete.

**Verification**:

* Command/check: `bun -e 'import { AI_ROGUE_AUTHORED_LEVEL_DEPTHS, AI_ROGUE_LEVEL_SPECS, levelSpecForDepth } from "./src/extensions/ai-rogue/runtime/content/levels"; import { validateAiRogueContentRegistry } from "./src/extensions/ai-rogue/runtime/content/validate"; ...'`
  * Result: PASS - direct registry check accepts the new authored level.
  * Evidence: output showed depths `[1,2,3,4]`, IDs including `firewall-gauntlet`, depth 3 finale `{ isFinalAuthoredLevel: false, bossKind: null, requiresFloorObjectiveClear: false }`, depth 4 finale `{ isFinalAuthoredLevel: true, bossKind: "kernel-sentinel", requiresFloorObjectiveClear: true }`, and validation `{ ok: true, issues: [] }`.
* UI product-surface check: N/A - runtime content data changed, no UI route or visual component changed.
* UI craft check: N/A - no UI changed.
* BQC Fixes: N/A - contract alignment checked through registry validation; no trust-boundary or lifecycle code changed.

***

### Task T002 - Audit fallback values and validation constraints

**Started**: 2026-06-30 20:53 **Completed**: 2026-06-30 20:55 **Duration**: 2 minutes

**Notes**:

* Confirmed non-authored depth 4 currently resolves through existing helper fallback paths: `themeForDepth(4) -> "firewall"`, `roomModifierForDepth(4) -> "threat-dense"`, `prefabForDepth(4) -> "hazard-cache"`, `terminalForDepth(4) -> "patch-mirror"`, `protocolForDepth(4) -> "trace-lance"`, `musicTrackForDepth(4) -> "sector_3"`, and `themeAmbienceForTheme("firewall") -> "theme_firewall_ambience"`.
* Confirmed floor-arc fallback for depth 4 still reuses the depth-3 objective arc: `purge-dumps`, `venom-daemon`, `phase-step`, no guaranteed pickup, and Kernel Arena lesson copy.
* Confirmed validation constraints in `validateAiRogueContentRegistry()` reject non-last finales, enforce a final marker on the last authored level, validate local references, require a concrete objective when a finale requires objective clearance, and avoid echoing unsafe values.
* Confirmed save-schema persisted ID arrays already include the reused protocol, terminal, enemy, and theme IDs needed by the authored fourth floor.

**Files Changed**:

* `.spec_system/specs/phase39-session04-existing-media-floor-four/implementation-notes.md` - recorded fallback and validation audit evidence.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/tasks.md` - marked T002 complete.

**Verification**:

* Command/check: `bun -e 'import { themeForDepth } from "./src/extensions/ai-rogue/runtime/themes"; import { prefabForDepth } from "./src/extensions/ai-rogue/runtime/prefabs"; import { terminalForDepth } from "./src/extensions/ai-rogue/runtime/terminals"; import { protocolForDepth } from "./src/extensions/ai-rogue/runtime/protocols"; import { floorArcForDepth, floorObjectiveForDepth } from "./src/extensions/ai-rogue/runtime/floor-arc"; import { createAiRogueWorld } from "./src/extensions/ai-rogue/runtime/world-generator"; ...'`
  * Result: PASS - executable helper audit returned the expected non-audio fallback values for depth 4.
  * Evidence: output showed `theme: "firewall"`, `prefab: "hazard-cache"`, `terminal: "patch-mirror"`, `protocol: "trace-lance"`, objective kind `purge-dumps`, and generated world theme `firewall` with a `kernel-sentinel` guard, vault, and terminal.
* Command/check: `sed -n '1028,1070p' src/extensions/ai-rogue/runtime/audio.ts`
  * Result: PASS - audio fallback inspected through source because the module uses Vite `import.meta.glob`.
  * Evidence: `musicTrackForDepth()` returns `sector_3` for depth greater than 2 when no authored spec exists, and `themeAmbienceForTheme("firewall")` returns `theme_firewall_ambience`.
* Command/check: `sed -n '261,620p' src/extensions/ai-rogue/runtime/content/validate.ts`
  * Result: PASS - final-level validation constraints and local reference checks inspected.
  * Evidence: `validateFinalePlacement()`, `validateLocalReferences()`, and `validateFinaleOwnership()` enforce last-level finale ownership and concrete objective requirements.
* Command/check: `bunx vitest run src/extensions/ai-rogue/runtime/__tests__/depth-resolver.test.ts`
  * Result: PASS - current resolver test suite is green before depth-4 migration.
  * Evidence: 1 test file passed, 4 tests passed.
* UI product-surface check: N/A - runtime content audit only; no route or visual surface changed.
* UI craft check: N/A - no UI changed.
* BQC Fixes: N/A - contract alignment and trust-boundary checks inspected; no source code changed in this task.

***

### Task T001 - Verify prior artifacts and Session 04 stub

**Started**: 2026-06-30 20:52 **Completed**: 2026-06-30 20:52 **Duration**: 0 minutes

**Notes**:

* Verified `.spec_system/state.json` lists Sessions 01-03 in completed sessions.
* Verified Sessions 01-03 each have `spec.md`, `tasks.md`, `implementation-notes.md`, `code-review.md`, `security-compliance.md`, `validation.md`, and `IMPLEMENTATION_SUMMARY.md`.
* Read Session 04 PRD stub and confirmed the planned reused-media fourth-floor scope: append one level spec, reuse existing IDs, no renderer/audio/simulation/save-schema branches unless a new persisted ID is introduced.
* Confirmed active registry validation and save-schema parity gates are present before editing.

**Files Changed**:

* `.spec_system/specs/phase39-session04-existing-media-floor-four/implementation-notes.md` - recorded setup evidence.
* `.spec_system/specs/phase39-session04-existing-media-floor-four/tasks.md` - marked T001 complete.

**Verification**:

* Command/check: `ls .spec_system/specs/phase39-session01-baseline-and-registry-skeleton .spec_system/specs/phase39-session02-depth-resolver-migration .spec_system/specs/phase39-session03-registry-validation-and-save-parity`
  * Result: PASS - all three session artifact directories contain the expected completed workflow files.
  * Evidence: command output listed `spec.md`, `tasks.md`, `implementation-notes.md`, `code-review.md`, `security-compliance.md`, `validation.md`, and `IMPLEMENTATION_SUMMARY.md` for each prior session.
* Command/check: `rg -n "phase39-session0[1-3].*|phase39-session01|phase39-session02|phase39-session03" .spec_system/state.json`
  * Result: PASS - prior sessions are recorded in spec-system state.
  * Evidence: matches include `phase39-session01-baseline-and-registry-skeleton`, `phase39-session02-depth-resolver-migration`, and `phase39-session03-registry-validation-and-save-parity`.
* Command/check: `sed -n '1,240p' .spec_system/PRD/phase_39/session_04_existing_media_floor_four.md`
  * Result: PASS - Session 04 reused-media scope and save round-trip deliverables inspected.
  * Evidence: PRD stub states the objective is a fourth floor backed by one level spec and focused tests while reusing existing media and IDs.
* Command/check: `rg -n "AI_ROGUE_LEVEL_SPECS|validateAiRogueContentRegistry|PARITY_CASES|AI_ROGUE_PERSISTED|levelSpecForDepth\\(4\\)|authoredLevelSpecForDepth\\(4\\)" src/extensions/ai-rogue/runtime/content/__tests__/levels.test.ts src/extensions/ai-rogue/__tests__/save-schema-parity.test.ts src/extensions/ai-rogue/runtime/content/levels.ts`
  * Result: PASS - active registry and save-schema parity test surfaces found.
  * Evidence: matches cover `validateAiRogueContentRegistry()` expectations and persisted ID parity cases for enemies, themes, protocols, and terminals.
* UI product-surface check: N/A - setup inspection only; no route or visual surface changed.
* UI craft check: N/A - no UI changed.

***

## Task Log

### 2026-06-30 - Session Start

**Environment verified**:

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

**Checks**:

* `bash .spec_system/scripts/analyze-project.sh --json` - PASS; current session resolved to `phase39-session04-existing-media-floor-four`, session directory exists, non-monorepo context.
* `bash .spec_system/scripts/check-prereqs.sh --json --env` - PASS; `.spec_system`, `jq`, and `git` available.
* Behavioral Quality Checklist loaded from apex-spec references because the session changes application runtime code and tests.

***


---

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