v2 foundation: shared contracts, app profile schema, wiring stubs

- projects: app profile columns + one app per org; project_external_git,
  deploy_targets, org_model_grants tables (migration a0f0e1d2c3b4)
- ports + fakes: RepoWorkspace, DeliveryHooks, DeployTarget, Memory,
  ModelGrants, WorkforceBootstrap; AppProfile + AppProfileRepository
- per-workstream wiring (container_org/engine/delivery), config blocks,
  empty routers, delivery worker, MCP/delivery service shells, web stubs
- admin nav derives from ADMIN_ITEMS; plan docs updated for ext4 worktrees

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

services/mcp-gateway/README.md

@@ -0,0 +1,6 @@
+# mcp-gateway
+
+HTTP (streamable) MCP server. Shell around `apps/api/app/interfaces/mcp/server.py`.
+Owned by the org-platform workstream; see `docs/plan/TODO-agent-1-org-platform.md` Phase 5.
+
+    pnpm mcp:dev