feat: /wiki-code umbrella — the /wiki for codebases (completes Mode B Code Wiki)

[RasenGUY]

Summary

Adds /wiki-code — the /wiki for codebases: a status-aware umbrella skill that turns the Mode B code-wiki family (wiki-code-ingest, wiki-code-lint, wiki-code-watch) into a single entry point, mirroring how /wiki fronts the prose-wiki sub-skills.

This is the capstone of the Mode B "Code Wiki" work. Because main does not yet contain any of the Mode B stack, this PR carries the whole feature (ingest → lint → watch → umbrella) so it stands alone.

Relationship to open PRs: this supersedes #81 (Mode B ingestion) and #82 (ingestion + /wiki-code-lint) — it contains their commits plus the /wiki-code umbrella and a test-wiring fix. If you merge this, #81 and #82 can be closed. Happy to split it back into incremental PRs if you'd rather land it in stages.

What's in this PR

Commit	What
10edf7c	Mode B codebase ingestion, drift lint, commit-triggered sync (= #81)
062a69a	fix: match abbreviated / inline code_anchors in the drift check
9580caa	/wiki-code-lint code-fidelity audit + emit aliases (= #82)
282ef1d	/wiki-code umbrella skill + wire two previously-unrun lint test suites (new)

The /wiki-code umbrella (new here)

skills/wiki-code/SKILL.md + commands/wiki-code.md, mirroring skills/wiki/SKILL.md:

• Read-only STATUS dashboard on a bare /wiki-code — vault presence, code-page counts, watched repos (code-sync-check.py --status --json), anchored pages (code-anchor-check.py --peek --json). Mutates nothing on a status call.
• First-run scaffold + ingest — /wiki-code <repo> scaffolds a minimal Mode B vault via bin/setup-vault.sh if none exists, then hands off to wiki-code-ingest, honoring its scope + module-list checkpoints.
• Routing — ingest / sync / watch / lint dispatch to the existing engines; code questions ("which modules depend on X") route to the existing /wiki-query (no new query skill — intentional). The umbrella never re-implements an engine.
• Coexists with /wiki — /wiki keeps its natural-language code routing; /wiki-code is the explicit, status-aware entry point. One CODE WIKI row added to /wiki's operations table.

Design decisions: full umbrella + status dashboard; reuse /wiki-query for code Q&A; auto-scaffold-then-ingest on first run.

Also fixed: two test suites that never ran

wiki-code-lint's check scripts (scripts/code-coverage-check.py, scripts/wiki-link-resolve-check.py) shipped with hermetic tests (tests/test_code_coverage_check.py, tests/test_wiki_link_resolve_check.py) that were never wired into make test. This PR adds test-code-coverage + test-link-resolve targets, taking the suite from 15 → 17.

Docs / packaging

• CLAUDE.md — Skills line, Plugin Skills table row, new "Code Wiki" section.
• README.md — skill count 15 → 18, code-wiki command rows, File Structure tree with accurate counts (18 skills / 19 scripts / 17 suites / 7 bin).
• CHANGELOG.md — [Unreleased] entries for the umbrella and the /wiki-code-lint slice; suite count 15 → 17.
• .claude-plugin/plugin.json + marketplace.json — 1.9.2 → 1.10.0.

Verification

• make test → 17/17 suites green (9 pre-existing + 8 new), exit 0.
• Both manifests valid JSON; version bump consistent across both.
• Every relative link, sub-skill name, and referenced script/flag in the new SKILL.md resolves (../wiki/references/modes.md, ../wiki/references/frontmatter.md, code-sync-check.py --status, code-anchor-check.py --peek, bin/setup-vault.sh, …).
• STATUS dashboard commands dry-run read-only with no errors.
• All README count claims reconciled against ground truth on disk.

Try it

/wiki-code                 # read-only status dashboard
/wiki-code <repo-path>     # scaffold (if needed) + map a repo as a Mode B architecture wiki
/wiki-code-lint            # code-fidelity audit (drift, staleness, coverage, link resolution)
/wiki-code-watch <repo>    # commit-triggered auto-sync