Root cause: duplicate agents wrote GOFAI code to public/nexus/app.js (wrong path)
instead of root app.js. The public/nexus/ files were corrupt duplicates that got
overwritten and eventually deleted, creating the illusion of disappearing code.
The classical AI code is fully present in root app.js — all 13 classes verified:
SymbolicEngine, AgentFSM, KnowledgeGraph, Blackboard, SymbolicPlanner,
HTNPlanner, CaseBasedReasoner, NeuroSymbolicBridge, MetaReasoningLayer,
AdaptiveCalibrator, PSELayer, plus A* search and bitmask fact indexing.
Prevention:
- Added public/nexus/ to .gitignore
- Added canonical file path documentation to CLAUDE.md
- Filed investigation report (INVESTIGATION_ISSUE_1145.md)
