Add deployment safeguards to prevent code mismatch issues

- Add /api/version endpoint with git commit and file checksums
- Create automated deploy.ps1 script with pre-flight checks
- Document file dependencies to prevent partial deployments
- Add version verification before and after deployment

Prevents: 4-hour debugging sessions due to production/local mismatch
Ensures: All dependent files deploy together atomically
Verifies: Production matches local code after deployment

api/main.py

@@ -36,6 +36,7 @@ from api.routers import (
     project_states,
     decision_logs,
     bulk_import,
+    version,
 )
 
 # Import middleware
@@ -104,6 +105,10 @@ async def health_check():
 
 
 # Register routers
+# System endpoints
+app.include_router(version.router, prefix="/api", tags=["System"])
+
+# Entity endpoints
 app.include_router(machines.router, prefix="/api/machines", tags=["Machines"])
 app.include_router(clients.router, prefix="/api/clients", tags=["Clients"])
 app.include_router(sites.router, prefix="/api/sites", tags=["Sites"])