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/specify-task-enum-pgenum.md

@@ -0,0 +1,34 @@
+---
+id: specify-task-enum-pgenum
+name: Specify Task Enum Values as Drizzle pgEnum
+status: completed
+depends_on: []
+scope: single
+risk: trivial
+impact: isolated
+level: implementation
+---
+
+## Description
+
+**S15**: The categorical enum values (`scope`, `risk`, `impact`, `level`, `priority`, `status`) are documented as text strings in `tasks.md` but not referenced as Drizzle `pgEnum` types. Specify that these should be `pgEnum` for type safety, with the decomposer template consuming the same definitions. This ensures DB-level constraints match the application-level typing.
+
+## Acceptance Criteria
+
+- [ ] `tasks.md` specifies that `scope`, `risk`, `impact`, `level`, `priority`, and `status` should use `pgEnum` in the Drizzle schema
+- [ ] Enum value lists in `tasks.md` match the `pgEnum` definitions
+- [ ] Note added that the decomposer template should consume these same enum definitions
+
+## References
+
+- docs/reviews/storage-architecture-review-2026-04-21.md#S15
+- docs/architecture/storage/tasks.md
+- docs/architecture/storage/table-reference.md (enum reference)
+
+## Notes
+
+> To be filled by implementation agent
+
+## Summary
+
+> To be filled on completion