Limina source snapshot vendored into agentic-experiments.

Upstream version:          0.1.0  (see ./VERSION)
Vendored on:               2026-04-20
Vendored from archive at:  C:\Vaults\SecondBrain\repos\agentic-experiments\reference\limina\
Vendor policy:             One-time fork. Not resynced from upstream.

Files under this directory are the forked copy; the pristine snapshot is
preserved at ``reference/limina/`` at the repo root for diff provenance.

Changes applied during vendoring:
- Replaced the 4 shell hooks with cross-platform Python ports:
    scripts/hooks/session_start.sh       -> session_start.py
    scripts/hooks/enforce_hef_chain.sh   -> enforce_hef_chain.py
    scripts/hooks/kb_write_guard.sh      -> kb_write_guard.py
    scripts/hooks/stop_validate.sh       -> stop_validate.py
- Refactored scripts/hooks/_parse_hook_input.py into an importable module
  (preserved CLI fallback for backward compatibility).
- Translated .claude/settings.json into ./claude_settings.json with the
  hook commands rewritten from `bash ...sh` to `python ...py`.
- Dropped upstream setup.sh (its clone-and-reinit flow is replaced by
  aexp.install.install_limina).
- Dropped upstream requirements.txt (the sole entry, python-frontmatter,
  is now a first-class dependency in agentic-experiments' pyproject.toml).
