* docs: add VitePress site with auto-generated CLI reference

Scaffold a VitePress docs site (home, getting-started guide, CLI reference)
and a GitHub Pages workflow that rebuilds and deploys on push to main.

The CLI reference is generated from the live commander program by
scripts/gen-cli-docs.ts, so it stays in sync with each release. Refactor
src/cli/index.ts into a buildProgram() factory (src/cli/program.ts) so the
CLI and the docs generator share one authoritative command registry.

Also:
- eslint: ignore dist/, coverage/, docs/, node_modules/ for repo-wide runs
- config: doc_tool sphinx -> vitepress, comment_style sphinx -> tsdoc
- config: scope npm audit gates to production deps (--omit=dev); dev-only
  tooling CVEs do not ship in the published package
- bump version to 0.1.6

The generated reference and VitePress build artifacts are gitignored.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* feat(skills): record test baseline before code changes

"Pre-existing failure" was unfalsifiable — skills checked "existing
tests must keep passing" but never recorded what was failing before
the change, so a regression and an already-red test looked identical
and surfaced only at the end.

Add shared references/test-baseline.md: capture the failing set at
change start, user accepts up front, verify diffs against it. A
failure is "pre-existing" only if it's in baseline.md. Wired into
grimoire-apply (capture), grimoire-bug, grimoire-refactor, and
grimoire-verify (classify regression vs pre-existing). Skippable but
recorded, never silent.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>