Review fixes on top of the `codeman doctor` checker:
- Node minVersion 18.0.0 -> 22.0.0. package.json engines is ">=22.0.0" and the docs/CI
require Node 22+, so doctor was green-lighting Node 18-21 (a false pass).
- Remove the phantom `gemini` registry entry. Codeman has no Gemini backend
(SessionMode = 'claude' | 'shell' | 'opencode' | 'codex'); the entry advertised a
dependency that nothing uses.
- Add `pdftoppm` (poppler) to the office group. document-thumbnailer.ts calls pdftoppm
with no fallback as the sole PDF/Office first-page thumbnail renderer, yet it was
absent from the registry, so doctor never reported it missing.
- Fix the `--category` mismatch: the help advertised `documents|media` categories that
the ToolCategory type/registry never defined, and an unknown category silently
produced an empty "all healthy" table. Introduce TOOL_CATEGORIES as the single source
of truth (type + help + validation); an invalid `--category` now errors with the
valid list and exits 2.
Verified: tsc, lint, format:check all clean; both dependency tests pass (20);
`doctor` runs correctly (Node 22.22 ok, pdftoppm detected, no gemini), `--category media`
errors with exit 2, `--category office` lists libreoffice/pdftoppm/msoffice.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude (Codeman maintainer)
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