Audit and reconcile documentation with implemented behavior

[pacphi]

Documentation mixed implemented behavior with proposals, historical snapshots, and unsupported runtime guarantees. This audit reconciles those claims against baseline 67fb5c0 (the #210 squash merge), with a disposition and baseline hash for all 200 tracked documentation/artifact files.

• Correct ADR status and current-versus-historical boundaries, DDD terminology, host/model/context contracts, privacy/egress/ownership statements, usage formulas and current UI descriptions.
• Repair contributor/install/Docker instructions, generated CLI/model-help wording, and two active transcript diagrams. Historical screenshots and frozen bodies remain dated evidence.
• Make 88 links from npm-bundled guides open repository documentation when the target is not shipped. Expand Markdown/link checks to maintainer, Docker and shipped references; check local anchors in CI.
• Record eight separate implementation follow-up groups. Four have actual-source synthetic reproductions: OpenCode cost undercount, unpaired context chips, lossy legacy router undo, and standalone diagnostic divergence/privacy. This PR does not change their runtime behavior.

Audit report · 200-file inventory · Implementation follow-ups. The report links per-file ADR, DDD, host, dashboard, core and historical/artifact evidence matrices.

Validation

• Full npm test: 3,829 passed, six skipped, followed by all legacy script suites passing.
• Typecheck, lint, complexity, Markdown and build checks passed. Routing IDs, tiers, defaults, dispatch, pricing, teardown and authorization logic are unchanged; source edits are documentation text and check configuration.
• External link sweep: 1,653 references, 774 unique, zero errors; 14 excluded and seven redirects. Expanded offline/anchor checks pass.
• All 200 inventory hashes match the baseline; no missing owner dispositions. Synthetic reproduction output records its primary-source digests.
• Field manual and corrected SVGs rendered in Chromium; desktop/narrow layouts checked. All 21 historical PNGs passed integrity/dimension checks; their bytes are unchanged.
• Independent integration review found no blockers. GitHub CI is green on a7fd01b: all nine OS/Node jobs, quality, browser, expanded internal/anchor links, and both maintainer/consumer devcontainers passed.

Limits

The 88 historical/supporting artifacts have explicit review levels; this is not a claim of re-running every old experiment or validating every historical statement. Twelve frozen relocation-link occurrences remain preserved with successor mappings. No host installation, paid inference, real-user teardown, release, or entitlement probe was performed. Implementation follow-ups are documented, not silently fixed.

Fixes #211. No merge is authorized by this task.