> 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-session02-depth-resolver-migration/implementation_summary.md).

# Implementation Summary

**Session ID**: `phase39-session02-depth-resolver-migration` **Completed**: 2026-06-30 **Duration**: 3.0 hours

***

## Overview

Completed the Phase 39 Session 02 depth resolver migration. The session routes AI Rogue's authored max depth, compatibility helpers, world generation, run creation, descent, and guarantee application through level specs while keeping depth 1-3 shipped outputs stable.

The work also adds focused resolver and route-safety coverage so generated floors keep reachable exits, adjacent guards, connected prefabs, and non-blocking terminals or vaults before later registry and content expansion sessions begin.

***

## Deliverables

### Files Created

| File                                                                                    | Purpose                                                                 | Lines |
| --------------------------------------------------------------------------------------- | ----------------------------------------------------------------------- | ----- |
| `src/extensions/ai-rogue/runtime/__tests__/depth-resolver.test.ts`                      | Resolver, max-depth, protocol separation, and legacy fallback coverage. | 69    |
| `.spec_system/specs/phase39-session02-depth-resolver-migration/spec.md`                 | Session specification.                                                  | 351   |
| `.spec_system/specs/phase39-session02-depth-resolver-migration/tasks.md`                | Completed task checklist.                                               | 76    |
| `.spec_system/specs/phase39-session02-depth-resolver-migration/implementation-notes.md` | Task evidence and implementation log.                                   | 664   |
| `.spec_system/specs/phase39-session02-depth-resolver-migration/code-review.md`          | Code review and repair report.                                          | 129   |
| `.spec_system/specs/phase39-session02-depth-resolver-migration/security-compliance.md`  | Security and compliance report.                                         | 117   |
| `.spec_system/specs/phase39-session02-depth-resolver-migration/validation.md`           | Validation report.                                                      | 248   |

### Files Modified

| File                                                          | Changes                                                                                          |
| ------------------------------------------------------------- | ------------------------------------------------------------------------------------------------ |
| `src/extensions/ai-rogue/runtime/content/levels.ts`           | Added non-throwing authored-depth lookup and shared lookup path.                                 |
| `src/extensions/ai-rogue/runtime/content/index.ts`            | Exported authored level lookup helper.                                                           |
| `src/extensions/ai-rogue/runtime/content/types.ts`            | Added projection aliases derived from `AiRogueLevelSpec`.                                        |
| `src/extensions/ai-rogue/runtime/run-factory.ts`              | Derived `AI_ROGUE_MAX_DEPTH` from level specs and applied resolved guarantees.                   |
| `src/extensions/ai-rogue/runtime/floor-arc.ts`                | Added `applyLevelGuarantees()` and kept `applyFloorArc()` as a shim.                             |
| `src/extensions/ai-rogue/runtime/themes.ts`                   | Projected authored themes from level specs with legacy fallback.                                 |
| `src/extensions/ai-rogue/runtime/prefabs.ts`                  | Projected authored prefabs from level specs with legacy fallback.                                |
| `src/extensions/ai-rogue/runtime/protocols.ts`                | Projected baseline protocols from level specs while preserving rotation fallback.                |
| `src/extensions/ai-rogue/runtime/terminals.ts`                | Projected authored terminals from level specs with legacy fallback.                              |
| `src/extensions/ai-rogue/runtime/audio.ts`                    | Projected authored music tracks from level specs.                                                |
| `src/extensions/ai-rogue/runtime/world-placement.ts`          | Accepted a resolved exit-guard kind.                                                             |
| `src/extensions/ai-rogue/runtime/world-generator.ts`          | Resolved one level spec per authored floor for theme, enemies, placements, and protocol routing. |
| `src/extensions/ai-rogue/runtime/simulation.ts`               | Used resolved level guarantees during descent.                                                   |
| `src/extensions/ai-rogue/runtime/__tests__/audio.test.ts`     | Covered registry-backed music helper behavior.                                                   |
| `src/extensions/ai-rogue/runtime/__tests__/floor-arc.test.ts` | Covered level guarantees and floor-arc shim parity.                                              |
| `src/extensions/ai-rogue/runtime/__tests__/prefabs.test.ts`   | Covered registry-backed prefab behavior.                                                         |
| `src/extensions/ai-rogue/runtime/__tests__/protocols.test.ts` | Covered baseline protocol projection and fallback rotation.                                      |
| `src/extensions/ai-rogue/runtime/__tests__/terminals.test.ts` | Covered registry-backed terminal behavior.                                                       |
| `src/extensions/ai-rogue/runtime/__tests__/themes.test.ts`    | Covered authored theme projection and fallback behavior.                                         |
| `src/extensions/ai-rogue/runtime/__tests__/world.test.ts`     | Added route-safety coverage for exits, guards, prefabs, terminals, and vaults.                   |
| `.spec_system/state.json`                                     | Marked Session 02 completed and cleared the current session.                                     |
| `.spec_system/PRD/phase_39/PRD_phase_39.md`                   | Updated progress, tracker, completed sessions, and upcoming session.                             |
| `.spec_system/PRD/PRD.md`                                     | Marked Phase 39 in progress.                                                                     |
| `README.md`                                                   | Updated project version reference.                                                               |
| `docs/CHANGELOG.md`                                           | Added Session 02 release notes.                                                                  |
| `package.json`                                                | Incremented patch version.                                                                       |

***

## Technical Decisions

1. **Registry-backed wrappers**: Existing helper names stay stable while authored depth 1-3 values project from level specs.
2. **Single resolved spec per floor**: World generation resolves one level spec and passes its authored decisions through generation, placement, and guarantee paths.
3. **Separate baseline and guarantee protocols**: Baseline world placement and floor-arc guaranteed protocols remain distinct because current gameplay uses both concepts.
4. **Explicit fallback boundaries**: Non-authored direct helper calls retain documented legacy clamp or rotation behavior without becoming the main-run authored policy.

***

## Test Results

| Metric        | Value                          |
| ------------- | ------------------------------ |
| Focused Tests | 94 passed                      |
| Full Tests    | 4625 passed                    |
| Coverage      | Not reported by `bun run test` |

Additional validation passed for `bun run typecheck`, `bun run typecheck:scripts`, `bun run lint`, `bun run lint:md`, targeted Prettier, whitespace, ASCII/LF, privacy, security, behavioral quality, and UI product-surface checks.

***

## Lessons Learned

1. Internal runtime modules should import level implementations directly rather than through the content barrel to avoid initialization cycles.
2. Explicit `levelSpec` callers need objective state derived from the resolved arc, not from a separate depth helper.
3. Route-safety tests are useful before content expansion because placement changes can silently disconnect exits or block paths.

***

## Future Considerations

Items for future sessions:

1. Add registry ID parity and save-schema validation gates in Session 03.
2. Prove the workflow with a reused-media fourth floor after validation gates are active.
3. Keep depth 1-3 baseline and golden determinism tests unchanged unless a deliberate behavior change is documented.

***

## Session Statistics

* **Tasks**: 20 completed
* **Files Created**: 8
* **Files Modified**: 26
* **Tests Added**: 15
* **Blockers**: 0 resolved


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/.spec_system/archive/sessions/phase39-session02-depth-resolver-migration/implementation_summary.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.