Token Aware Discovery

# Token-Aware Discovery Module

When broad code discovery is needed:
- read README, AGENTS, PROJECT_MAP and architecture docs first;
- avoid scanning the whole repository by default;
- build a compact evidence map;
- verify critical findings before editing;
- update PROJECT_MAP when the memory is stale.

Evidence map format:
- path:line
- symbol or route
- relevant snippet or signature
- why it matters