unregisterSidecar rejected every entry in the pending map, not just the ones
belonging to the sidecar that went away. Restarting any single sidecar failed
in-flight work on every other: `pm2 restart officer-music` could kill a running
agent turn with `Sidecar "music" disconnected` — a message pointing at a process
that had nothing to do with it. Pending entries now carry their owning sidecar
id and the rejection loop skips the rest.
Also deletes src/servers/api/anthropic-proxy.ts. It had no importers; PM2's
officer-anthropic-proxy runs src/servers/sidecar/claude/index.ts.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
