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# Implementation Summary

**Session ID**: `phase30-session06-dungeon-simulation-core` **Completed**: 2026-06-22 **Duration**: 1 hour

***

## Overview

Session 06 added the renderer-independent AI Rogue dungeon simulation. The runtime now has deterministic seeded RNG, grid and world generation, entity templates, field-of-view and fog helpers, turn-based movement, hazards, pickups, win/loss handling, deterministic combat, two first-slice enemy behaviors, pointer command translation, stable fixtures, and focused tests.

***

## Deliverables

### Files Created

| File                                                           | Purpose                                                                             | Lines |
| -------------------------------------------------------------- | ----------------------------------------------------------------------------------- | ----- |
| `src/extensions/ai-rogue/runtime/rng.ts`                       | Seeded RNG primitives and deterministic helpers.                                    | 137   |
| `src/extensions/ai-rogue/runtime/world.ts`                     | Grid, tile semantics, world generation, passability, pickups, exits, and snapshots. | 447   |
| `src/extensions/ai-rogue/runtime/entities.ts`                  | Player, enemy, pickup, direction, behavior, and snapshot helpers.                   | 209   |
| `src/extensions/ai-rogue/runtime/fov.ts`                       | FOV, line-of-sight, explored tiles, and fog projection.                             | 156   |
| `src/extensions/ai-rogue/runtime/combat.ts`                    | Deterministic combat, damage, death, sentry threat, and capped logs.                | 222   |
| `src/extensions/ai-rogue/runtime/simulation.ts`                | Run creation, command reducer, turns, enemies, status, and snapshots.               | 514   |
| `src/extensions/ai-rogue/runtime/simulation-fixtures.ts`       | Stable seeds and test scenario helpers.                                             | 52    |
| `src/extensions/ai-rogue/runtime/__tests__/rng.test.ts`        | RNG determinism and edge coverage.                                                  | 104   |
| `src/extensions/ai-rogue/runtime/__tests__/world.test.ts`      | World generation, fixtures, passability, and spawn coverage.                        | 97    |
| `src/extensions/ai-rogue/runtime/__tests__/fov.test.ts`        | FOV, walls, explored tiles, and fog coverage.                                       | 47    |
| `src/extensions/ai-rogue/runtime/__tests__/combat.test.ts`     | Combat and enemy behavior coverage.                                                 | 108   |
| `src/extensions/ai-rogue/runtime/__tests__/simulation.test.ts` | End-to-end movement, events, terminal states, and snapshot coverage.                | 135   |

### Files Modified

| File                                                              | Changes                                                                   |
| ----------------------------------------------------------------- | ------------------------------------------------------------------------- |
| `.spec_system/state.json`                                         | Recorded Session 06 planned, validated, and completed history.            |
| `.spec_system/PRD/phase_30/PRD_phase_30.md`                       | Marked Session 06 complete and updated progress.                          |
| `.spec_system/PRD/phase_30/session_06_dungeon_simulation_core.md` | Marked status, prerequisites, and success criteria complete.              |
| `package.json`                                                    | Bumped patch version from `0.1.377` to `0.1.378`.                         |
| `README.md`                                                       | Updated the project version line to `0.1.378`.                            |
| `docs/CHANGELOG.md`                                               | Added the Phase 30 Session 06 release note.                               |
| `src/extensions/ai-rogue/runtime/types.ts`                        | Added serializable simulation contracts.                                  |
| `src/extensions/ai-rogue/runtime/input.ts`                        | Added pointer-to-tile and pointer-to-cardinal helpers.                    |
| `src/extensions/ai-rogue/runtime/index.ts`                        | Exported pure simulation modules without importing renderer code.         |
| `src/extensions/ai-rogue/runtime/__tests__/input.test.ts`         | Added pointer and command-boundary coverage.                              |
| `src/extensions/ai-rogue/runtime/__tests__/assets.test.ts`        | Added vocabulary alignment checks.                                        |
| `src/extensions/ai-rogue/__tests__/save-schema.test.ts`           | Added simulation completion-label compatibility checks.                   |
| `src/extensions/ai-rogue/save-schema.ts`                          | Added local structural run summary compatibility without runtime imports. |
| `vitest.config.ts`                                                | Added narrow visual runtime coverage exclusions for renderer-only files.  |

***

## Technical Decisions

1. **Pure simulation boundary**: The dungeon model stays in TypeScript modules with no PixiJS, DOM, storage, network, or route imports so Session 07 can render stable snapshots instead of owning game rules.
2. **Seeded fixtures over hidden randomness**: Named seeds and fixture worlds make generation, combat, FOV, movement, win, and loss paths repeatable.
3. **Atlas vocabulary by string**: Tile and entity kinds align with committed atlas frame names without importing image assets into pure simulation code.
4. **Bounded snapshots and logs**: Public run state exposes serializable, capped data suitable for later persistence and UI consumption.

***

## Test Results

| Metric        | Value                                                              |
| ------------- | ------------------------------------------------------------------ |
| Focused Tests | 40/40 passed                                                       |
| Full Tests    | 3961/3961 passed                                                   |
| Coverage      | Statements 86.05%, Branches 76.00%, Functions 91.84%, Lines 88.71% |
| Typecheck     | Passed                                                             |

***

## Lessons Learned

1. Keeping the save schema structurally typed preserves the lazy runtime boundary and avoids importing simulation types into guarded schema code.
2. Pure fixture worlds are useful for testing deterministic paths that would be brittle if asserted only through generated maps.

***

## Future Considerations

Items for future sessions:

1. Session 07 should consume the simulation snapshots and lifecycle events without moving rules into the PixiJS renderer.
2. Session 07 should connect one wallet-backed upgrade to simulation inputs while keeping full dungeon persistence deferred unless necessary.
3. Session 08 can expand enemies, boss behavior, classes, relics, and deeper progression on top of the stable pure reducer.

***

## Session Statistics

* **Tasks**: 22 completed
* **Files Created**: 12
* **Files Modified**: 14
* **Tests Added**: 5 new test files plus expanded existing tests
* **Blockers**: 0 resolved


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