feat(tools): expose installed manual actions

[huangzesen]

Summary

• add a shared read-only loader for manuals installed under .library/intrinsic/capabilities
• expose action="manual" on 12 built-in tools:
  • shell → shell
  • daemon → daemon
  • email → email
  • psyche → psyche-manual
  • read → read-manual
  • soul → soul-manual
  • system → system-manual
  • web_search → web-search-manual
  • write / edit / glob / grep → file-manual
• preserve runtime validation for ordinary file/search operations while allowing bare manual calls
• bundle the complete 26-file TUI web-browsing skill (source commit 0a83a942) under web_search/manual/, including routed references, assets, and extract_page.py / cached_get.py
• use collision-safe root name web-search-manual, rewrite active helper examples to <skill-path>/scripts, and retain the old TUI path only in the historical v2 migration note
• ship the full bundle in both wheels and sdists

Validation

• focused manual-action, ordinary web_search, installer-copy, and architecture tests — 25 passed
• real wheel + sdist bundle manifest checks (all 26 files) — 2 passed
• earlier focused shell/soul/psyche/system/notification schema checks — 18 passed
• post-rebase manual/shell/soul smoke — 8 passed
• all four new SKILL.md timestamps parsed as timezone-aware ISO 8601
• skill validator, py_compile, portability scan, and git diff --check