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/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "@agy/mcp-gateway",
+  "version": "0.1.0",
+  "private": true,
+  "description": "MCP gateway — lets AI agents control an organization through scoped tokens.",
+  "scripts": {
+    "dev": "cd ../../apps/api && .venv/bin/python -m app.interfaces.mcp.server",
+    "lint": "cd ../../apps/api && .venv/bin/python -m ruff check app/interfaces/mcp"
+  }
+}