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/fix-parts-timestamps-spec.md

@@ -0,0 +1,37 @@
+---
+id: fix-parts-timestamps-spec
+name: Fix Parts Table Timestamp NOT NULL and onUpdate Spec
+status: completed
+depends_on: []
+scope: narrow
+risk: low
+impact: isolated
+level: implementation
+---
+
+## Description
+
+W22: The `parts` table defines its own `id`, `metadata`, `createdAt`, `updatedAt` instead of using `commonCols`, but the spec only says "defaults to `now()`" without specifying NOT NULL or `$onUpdate`. If the Drizzle implementation omits `$onUpdate`, parts rows never have `updatedAt` updated on modification. If timestamps are not NOT NULL, they can become NULL.
+
+The `parts` table spec must explicitly state that `createdAt` and `updatedAt` are NOT NULL and that `updatedAt` includes `$onUpdate(() => new Date())`. Either replicate these details from `commonCols` with an explicit override note for `id`, or reference `commonCols` with the `id` exception documented.
+
+## Acceptance Criteria
+
+- [ ] `sessions.md` parts table: `createdAt` and `updatedAt` specified as `NOT NULL`
+- [ ] `updatedAt` specified with `$onUpdate(() => new Date())`
+- [ ] Note added explaining why `parts` uses custom columns instead of `commonCols` (sortable ID vs UUIDv4)
+- [ ] `id` column exception documented (sortable ID, not UUIDv4 from commonCols)
+
+## References
+
+- docs/reviews/storage-architecture-review-2026-04-21.md#W22
+- docs/architecture/storage/sessions.md:99-107
+- docs/architecture/storage/README.md:69-82
+
+## Notes
+
+> To be filled by implementation agent
+
+## Summary
+
+> To be filled on completion