chore(container): drop v1 IPC dirs and update entrypoint comment

The /workspace/ipc/* tree is a v1 leftover — v2 routes everything
through inbound.db / outbound.db. Refresh the surrounding comment to
describe what the entrypoint actually does.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

container/Dockerfile

@@ -49,12 +49,13 @@ COPY agent-runner/ ./
 RUN npm run build
 
 # Create workspace directories
-RUN mkdir -p /workspace/group /workspace/global /workspace/extra /workspace/ipc/messages /workspace/ipc/tasks /workspace/ipc/input
+RUN mkdir -p /workspace/group /workspace/global /workspace/extra
 
-# Create entrypoint script
-# Container input (prompt, group info) is passed via stdin JSON.
-# Credentials are injected by the host's credential proxy — never passed here.
-# Follow-up messages arrive via IPC files in /workspace/ipc/input/
+# Create entrypoint script.
+# The host mounts container/agent-runner/src at /app/src and the entrypoint
+# recompiles on startup — this lets host source edits and skill installs
+# take effect without rebuilding the image. All IO goes through the session
+# DBs (inbound.db / outbound.db) mounted into /workspace.
 RUN printf '#!/bin/bash\nset -e\ncd /app && npx tsc --outDir /tmp/dist 2>&1 >&2\nln -s /app/node_modules /tmp/dist/node_modules\nchmod -R a-w /tmp/dist\ncat > /tmp/input.json\nnode /tmp/dist/index.js < /tmp/input.json\n' > /app/entrypoint.sh && chmod +x /app/entrypoint.sh
 
 # Set ownership to node user (non-root) for writable directories