Fix: restore worktree sidebar threads and delete flows

[xIGBClutchIx]

Summary

This restores missing local worktree threads in the sidebar and fixes settings-triggered worktree deletion so Pocodex once again shows and manages Codex worktrees the way the current desktop bundle expects.

What changed

• route local codex-worktrees, resolve-worktree-for-thread, and delete-worktree requests through Pocodex instead of relying on unsupported direct bundle worker paths
• add vscode://codex/worktree-delete handling in the app-server bridge and normalize settings-targeted deletes before forwarding them to the git worker
• discover worktrees across local Codex-home candidates and resolve thread-owned worktrees locally in the desktop git worker, including non-hex worktree directory names
• report a browser-facing Codex-home path that keeps WSL worktree threads visible to the current sidebar relevance filter
• add regression coverage for host data, request-id routing, worktree deletion, Codex-home selection, and local git-worker worktree resolution

Root cause

• the current Codex bundle filters sidebar visibility for local threads against a single codexHome path, which caused valid /root/.codex/worktrees/... threads to disappear when Pocodex surfaced a Windows-side Codex home in WSL
• the settings UI deletes worktrees through vscode://codex/worktree-delete, but Pocodex did not implement that host fetch route
• the bundle also expected local worktree worker methods to round-trip through the browser/host bridge, while Pocodex only supported the older direct paths

Impact

• missing worktree conversations show up in the Threads sidebar again
• settings-based worktree deletion succeeds instead of failing with Failed to delete worktree
• local worktree listing and per-thread worktree resolution are covered by focused regressions, including mixed Codex-home WSL setups

Validation

• pnpm run check:commit
• pnpm vitest run test/app-server-bridge-worktree-delete.test.ts test/codex-home.test.ts test/app-server-bridge-host-data.test.ts test/codex-desktop-git-worker.test.ts test/request-id.test.ts --maxWorkers=1
• live local verification on fresh Pocodex dev servers confirmed /settings/worktrees showed the previously missing worktrees, settings delete removed a worktree without the failure toast, and http://127.0.0.1:8806/local/019d9486-c2e6-7eb2-9f38-892730afdb09 showed the missing summary worktree thread in the left sidebar