# Investigation Report: Missing Source Code — Classical AI Commits Disappearing

**Issue:** #1145
**Date:** 2026-04-10
**Investigator:** mimo-v2-pro swarm worker

## Summary

**The classical AI code is NOT missing. It is fully present in root `app.js` (3302 lines).**

The perception of "disappearing code" was caused by agents writing to the WRONG file path (`public/nexus/app.js` instead of root `app.js`), creating corrupt duplicate files that were repeatedly overwritten and eventually deleted.

## Root Cause

**Explanation #1 confirmed: Duplicate agents on different machines overwriting each other's commits.**

Multiple Google AI Agent instances wrote GOFAI implementations to `public/nexus/app.js` — a path that does not correspond to the canonical app structure. These commits kept overwriting each other:

| Commit | Date | What happened |
|--------|------|---------------|
| `8943cf5` | 2026-03-30 | Symbolic reasoning engine written to `public/nexus/app.js` (+2280 lines) |
| `e2df240` | 2026-03-30 | Phase 3 Neuro-Symbolic Bridge — overwrote to 284 lines of HTML (wrong path) |
| `7f2f23f` | 2026-03-30 | Phase 4 Meta-Reasoning — same destructive overwrite |
| `bf3b98b` | 2026-03-30 | A* Search — same destructive overwrite |
| `e88bcb4` | 2026-03-30 | Bug fix identified `public/nexus/` files as corrupt duplicates, **deleted them** |

## Evidence: Code Is Present on Main

All 13 classical AI classes/functions verified present in root `app.js`:

| Class/Function | Line | Status |
|----------------|------|--------|
| `SymbolicEngine` | 82 | ✅ Present |
| `AgentFSM` | 135 | ✅ Present |
| `KnowledgeGraph` | 160 | ✅ Present |
| `Blackboard` | 181 | ✅ Present |
| `SymbolicPlanner` | 210 | ✅ Present |
| `HTNPlanner` | 295 | ✅ Present |
| `CaseBasedReasoner` | 343 | ✅ Present |
| `NeuroSymbolicBridge` | 392 | ✅ Present |
| `MetaReasoningLayer` | 422 | ✅ Present |
| `AdaptiveCalibrator` | 460 | ✅ Present |
| `PSELayer` | 566 | ✅ Present |
| `setupGOFAI()` | 596 | ✅ Present |
| `updateGOFAI()` | 622 | ✅ Present |
| Bitmask fact indexing | 86 | ✅ Present |
| A* search | 231 | ✅ Present |

These were injected by commit `af7a4c4` (PR #775, merged via `a855d54`) into the correct path.

## What Actually Happened

1. Google AI Agent wrote good GOFAI code to root `app.js` via the correct PR (#775)
2. A second wave of Google AI Agent instances also wrote to `public/nexus/app.js` (wrong path)
3. Those `public/nexus/` files kept getting overwritten by subsequent agent commits
4. Commit `e88bcb4` correctly identified the `public/nexus/` files as corrupt and deleted them
5. Alexander interpreted the git log as "classical AI code keeps disappearing"
6. The code was never actually gone — it just lived in root `app.js` the whole time

## Prevention Strategy

1. **Add `public/nexus/` to `.gitignore`** — prevents agents from accidentally writing to the wrong path again
2. **Add canonical path documentation to CLAUDE.md** — any agent reading this repo will know where frontend code lives
3. **This report** — serves as the audit trail so this confusion doesn't recur

## Acceptance Criteria

- [x] Git history audited for classical AI commits
- [x] Found the commits — they exist, code was written to wrong path
- [x] Root cause identified — duplicate agents writing to `public/nexus/` (wrong path)
- [x] Prevention strategy implemented — `.gitignore` + `CLAUDE.md` path guard
- [x] Report filed with findings (this document)