Setup repo: migrate architecture specs, code stubs, and tasks from alkhub_ts

Copy architecture docs, ADRs, storage domain specs, research, reviews,
and 56 storage architecture tasks from the alkhub_ts monorepo. Adapt for
standalone @alkdev/hub repo structure (src/ not packages/hub/).

Sanitize all sensitive information:
- Replace private IPs (10.0.0.1) with localhost defaults
- Remove internal server hostnames (dev1, ns528096)
- Replace /workspace/ private paths with npm package references
- Remove hardcoded credentials from examples
- Rewrite infrastructure.md without private network details

Add Deno project scaffolding: deno.json (pinned deps), .gitignore,
AGENTS.md, entry point. Migrate existing code stubs (crypto, config
types, logger) with updated import paths.

tasks/architecture/storage/add-audit-log-context.md

@@ -0,0 +1,37 @@
+---
+id: add-audit-log-context
+name: Add Session and Org Context to Audit Logs
+status: completed
+depends_on: []
+scope: narrow
+risk: low
+impact: component
+level: implementation
+---
+
+## Description
+
+W12: `audit_logs` has `ownerId` and `keyId` but no `sessionId` or `orgId`. For LLM accounts in sessions, session correlation is a traceability gap. Multi-tenant auditing requires org filtering.
+
+Add `sessionId` (nullable FK → sessions.id, SET NULL) and `orgId` (nullable FK → organizations.id, SET NULL) to the `audit_logs` table spec. Expand `action` types to cover account, membership, and organization lifecycle events, or document the `action` enum as extensible.
+
+## Acceptance Criteria
+
+- [ ] `identity.md` audit_logs table includes nullable `sessionId` and `orgId` columns
+- [ ] FK cascade behavior documented (SET NULL for both)
+- [ ] `table-reference.md` cascade table includes the two new FK entries
+- [ ] `action` enum either expanded with lifecycle event types or documented as extensible
+- [ ] `table-reference.md` enum section updated
+
+## References
+
+- docs/reviews/storage-architecture-review-2026-04-21.md#W12
+- docs/architecture/storage/identity.md:103-117
+
+## Notes
+
+> To be filled by implementation agent
+
+## Summary
+
+> To be filled on completion