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

docs/README.md

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+<!-- read_when: starting substantial work in this repo or looking for the internal source of truth -->
+
+# SubMiner Internal Docs
+
+Status: active  
+Last verified: 2026-03-13  
+Owner: Kyle Yasuda  
+Read when: you need internal architecture, workflow, verification, or release guidance
+
+`docs/` is the internal system of record for agent and contributor knowledge. Start here, then drill into the smallest doc that fits the task.
+
+## Start Here
+
+- [Architecture](./architecture/README.md) - runtime map, domains, layering rules
+- [Workflow](./workflow/README.md) - planning, execution, verification expectations
+- [Knowledge Base](./knowledge-base/README.md) - how docs are structured, maintained, and audited
+- [Release Guide](./RELEASING.md) - tagged release checklist
+- [Plans](./plans/) - active design and implementation artifacts
+
+## Fast Paths
+
+- New feature or refactor: [Workflow](./workflow/README.md), then [Architecture](./architecture/README.md)
+- Test/build/release work: [Verification](./workflow/verification.md), then [Release Guide](./RELEASING.md)
+- “What owns this behavior?”: [Domains](./architecture/domains.md)
+- “Can these modules depend on each other?”: [Layering](./architecture/layering.md)
+- “What doc should exist for this?”: [Catalog](./knowledge-base/catalog.md)
+
+## Rules
+
+- Treat `docs/` as canonical for internal guidance.
+- Treat `docs-site/` as user-facing/public docs.
+- Keep `AGENTS.md` short; deep detail belongs here.
+- Update docs when behavior, architecture, or workflow meaningfully changes.