Fix/WA reconnect, container perms, assist name in env (#297)

* fix: WA 515 stream error reconnect exiting early before key sync

Pass isReconnect flag on 515 reconnect so the registered-creds check
doesn't bail out before the handshake completes (caused "logging in..."
hang after successful pairing).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: container permission errors on Docker with non-default uid

Make /home/node world-writable in the Dockerfile so the SDK can write
.claude.json. Add --user flag matching host uid/gid in container-runner
so bind-mounted files are accessible. Skip when running as root (uid 0),
as the container's node user (uid 1000), or on native Windows.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: write ASSISTANT_NAME to .env during setup

When a custom assistant name is chosen, persist it to .env so config.ts
picks it up at runtime. Uses temp file for cross-platform sed
compatibility (macOS/Linux/WSL).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

container/Dockerfile

@@ -56,7 +56,7 @@ RUN mkdir -p /workspace/group /workspace/global /workspace/extra /workspace/ipc/
 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
-RUN chown -R node:node /workspace
+RUN chown -R node:node /workspace && chmod 777 /home/node
 
 # Switch to non-root user (required for --dangerously-skip-permissions)
 USER node