Fix: restore the Summary tab in Pocodex

[xIGBClutchIx]

Summary

This restores the missing Summary tab in Pocodex so the current Codex desktop bundle once again shows the full side-panel tab set for git-backed threads.

What changed

• plumb the real Codex bundle version, buildFlavor, and buildNumber through extension-info so the bundle evaluates the current Summary gate against the correct app identity
• propagate local host kind and host_config through the CLI runtime, app-server bridge, and bootstrap payload so the desktop webview sees the workspace as the correct host type during startup
• expose the shared-object snapshot fields and browser bridge compatibility hooks that the current bundle expects, including host_config, remote_connections, and the newer theme/menu bridge methods
• add the current desktop git-worker platform-family RPC support that the newer bundle now calls during its startup flow
• cover the restored bridge and bootstrap contracts with focused regression tests for extension info, host config, shared-object snapshots, and the git-worker RPC

Root cause

The missing Summary tab came from two newer Codex bundle assumptions that Pocodex was not satisfying:

• Pocodex reported placeholder extension-info, so the bundle evaluated the Summary Statsig gate against the wrong app identity
• Pocodex also missed newer desktop compatibility contracts around host_config, shared-object snapshots, and the git-worker startup RPCs
• once those startup contracts were incomplete, the side-panel shell did not fully initialize the git-backed thread UI that exposes Summary alongside Review

Impact

• git-backed thread side panels show Summary, Review, and Unstaged again in Pocodex
• the current desktop bundle gets the extension metadata and host bridge shape it now expects during startup
• focused regressions now cover the restored desktop compatibility surface so future bundle updates are easier to catch

Validation

• pnpm run check:commit
• pnpm exec vitest run test/app-server-bridge-basic.test.ts test/app-server-bridge-host-config.test.ts test/bootstrap-script.test.ts test/codex-desktop-git-worker.test.ts
• pnpm exec tsx src/cli.ts --dev --listen 127.0.0.1:8812
• live local verification on http://127.0.0.1:8812/ that opening the affected thread and toggling the side panel shows Summary, Review, and Unstaged