fix(agents): bundle workspace deps into flue runtime

Replace @code/env and @code/primitives imports with local modules so
the Node deploy artifact does not resolve workspace packages to
TypeScript source at runtime. Switch Docker build to pnpm frozen
install, add runner Dockerfile and a liveness health endpoint.

packages/agents/package.json

@@ -14,6 +14,7 @@
     "run:zopu": "node --env-file=../../.env node_modules/@flue/cli/bin/flue.mjs run zopu"
   },
   "dependencies": {
+    "@agentos-software/git": "0.3.3",
     "@code/env": "workspace:*",
     "@code/primitives": "workspace:*",
     "@flue/runtime": "npm:@rivet-dev/labs-flue-runtime@1.0.0-beta.9-rivet.2",