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-missing-indexes-identity.md

@@ -0,0 +1,45 @@
+---
+id: add-missing-indexes-identity
+name: Add Missing Indexes — Identity & Project Domain
+status: completed
+depends_on: []
+scope: narrow
+risk: low
+impact: component
+level: implementation
+---
+
+## Description
+
+W03 (partial): Add missing indexes for the identity and project domain tables. Also remove the redundant index identified in the review.
+
+Missing indexes:
+- `projects`: `idx_projects_org_id` on `(orgId)` — find projects for an org
+- `workspaces`: `idx_workspaces_project_id` on `(projectId)` — find workspaces for a project
+- `spokes`: `idx_spokes_name` on `(name)` — look up spoke by name
+
+Redundant index to remove:
+- `api_keys`: `idx_api_keys_key_hash` is redundant with `unq_api_keys_key_hash` (UNIQUE constraint auto-creates an index)
+
+## Acceptance Criteria
+
+- [ ] `table-reference.md` indexes section includes `idx_projects_org_id`, `idx_workspaces_project_id`, `idx_spokes_name`
+- [ ] Per-domain docs (`projects.md`, `spokes.md`) reference the new indexes
+- [ ] `idx_api_keys_key_hash` removed from `table-reference.md` with a note that UNIQUE constraint covers it
+- [ ] All new indexes have documented purpose (query pattern)
+
+## References
+
+- docs/reviews/storage-architecture-review-2026-04-21.md#W03
+- docs/architecture/storage/table-reference.md:87-145
+- docs/architecture/storage/identity.md
+- docs/architecture/storage/projects.md
+- docs/architecture/storage/spokes.md
+
+## Notes
+
+> To be filled by implementation agent
+
+## Summary
+
+> To be filled on completion