Align caveman docs, hooks, and test coverage

[diego-anselmo]

Problem
The caveman docs, hook behavior, and test coverage had drifted from the current command surface. In particular, natural-language activation and the /caveman:compress alias were not consistently reflected, and hook validation did not fully cover default-mode resolution and reinforcement output.

Changes

• Align README and related docs with the current commands, aliases, and activation behavior
• Update the mode tracker to recognize less tokens please and /caveman:compress
• Expose the help surface consistently in AGENTS.md and GEMINI.md
• Harden repo verification around hook output, mode persistence, compress mode, and Wenyan/commit/review flows
• Add unit coverage for resolving the default mode from XDG_CONFIG_HOME

Validation

• python3 tests/verify_repo.py
• python3 -m unittest tests/test_hooks.py

Notes

• Backwards-compatible: /caveman:compress remains supported while the newer command surface is documented consistently
• Changes were pushed to the fork first and are ready for upstream review