Adds SELF-KNOWLEDGE section to both SYSTEM_PROMPT_LITE and
SYSTEM_PROMPT_FULL with:
- Codebase map (all src/timmy/ modules with descriptions)
- Current capabilities list (grounded, not generic)
- Known limitations (real gaps, not LLM platitudes)
Lite prompt gets condensed version; full prompt gets detailed.
Timmy can now answer 'what does tool_safety.py do?' and give
grounded answers about his actual limitations.
10 new tests. 1456 total passing.