feat(stats): add v1 immersion stats dashboard (#19)

docs/knowledge-base/catalog.md

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+<!-- read_when: you need to know what internal docs exist, whether they are current, or what should be updated -->
+
+# Documentation Catalog
+
+Status: active  
+Last verified: 2026-03-13  
+Owner: Kyle Yasuda  
+Read when: finding internal docs or checking verification status
+
+| Area | Path | Status | Last verified | Notes |
+| --- | --- | --- | --- | --- |
+| KB home | `docs/README.md` | active | 2026-03-13 | internal entrypoint |
+| Architecture index | `docs/architecture/README.md` | active | 2026-03-13 | top-level runtime map |
+| Domain ownership | `docs/architecture/domains.md` | active | 2026-03-13 | runtime and feature ownership |
+| Layering rules | `docs/architecture/layering.md` | active | 2026-03-13 | dependency direction and smells |
+| KB rules | `docs/knowledge-base/README.md` | active | 2026-03-13 | maintenance policy |
+| Core beliefs | `docs/knowledge-base/core-beliefs.md` | active | 2026-03-13 | agent-first principles |
+| Quality scorecard | `docs/knowledge-base/quality.md` | active | 2026-03-13 | quality grades and gaps |
+| Workflow index | `docs/workflow/README.md` | active | 2026-03-13 | execution map |
+| Planning guide | `docs/workflow/planning.md` | active | 2026-03-13 | lightweight vs execution plans |
+| Verification guide | `docs/workflow/verification.md` | active | 2026-03-13 | maintained verification lanes |
+| Release guide | `docs/RELEASING.md` | active | 2026-03-13 | release checklist |
+| Active plans | `docs/plans/` | active | 2026-03-13 | task-scoped design and implementation artifacts |
+
+## Update Rules
+
+- Add a row when introducing a new core internal doc.
+- Update `Status` and `Last verified` when a page is materially revised.
+- If a page is known inaccurate, mark it stale immediately instead of leaving silent drift.