feat: remove container layer, run agents as direct host processes

- Rewrite container-runner.ts to spawn node processes directly instead
  of Docker/Apple Container
- Runner paths configurable via env vars (NANOCLAW_GROUP_DIR, etc.)
  with container-path defaults for backwards compat
- Pass real credentials directly (no credential proxy needed)
- Remove ensureContainerSystemRunning() and startCredentialProxy()
  from startup
- Add build:runners script for building agent-runner and codex-runner
- Fix TS strict mode errors in agent-runner ipc-mcp-stdio.ts

container/agent-runner/package-lock.json

@@ -724,6 +724,7 @@
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       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "accepts": "^2.0.0",
         "body-parser": "^2.2.1",
@@ -928,6 +929,7 @@
       "resolved": "https://registry.npmjs.org/hono/-/hono-4.11.8.tgz",
       "integrity": "sha512-eVkB/CYCCei7K2WElZW9yYQFWssG0DhaDhVvr7wy5jJ22K+ck8fWW0EsLpB0sITUTvPnc97+rrbQqIr5iqiy9Q==",
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=16.9.0"
       }
@@ -1507,6 +1509,7 @@
       "resolved": "https://registry.npmjs.org/zod/-/zod-4.3.6.tgz",
       "integrity": "sha512-rftlrkhHZOcjDwkGlnUtZZkvaPHCsDATp4pGpuOOMDaTdDDXF91wuVDJoWoPsKX/3YPQ5fHuF3STjcYyKr+Qhg==",
       "license": "MIT",
+      "peer": true,
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }