[codex] Remove retired Windsurf plugin on startup

[robinebers]

Summary

• Remove the retired bundled windsurf plugin folder from the app-data plugin install directory during startup.
• Filter retired bundled plugin IDs out of plugin loading as a defensive backstop.
• Add regression coverage for upgraded installs that still have a stale app_data/plugins/windsurf directory.

Root Cause

Auto-updated installs keep the persisted app-data plugin directory. The new release stopped bundling Windsurf, but startup only copied bundled plugins into app data and never pruned plugin folders removed from later bundles, so stale Windsurf code could still be discovered and loaded.

Impact

After the next release, upgraded users should no longer see the old Windsurf plugin. The cleanup only removes the retired bundled-code folder when its manifest ID is windsurf; plugin data and unrelated/custom plugin folders are left alone.

Validation

• cargo test --lib
• bun run test -- src/lib/settings.test.ts src/hooks/app/use-settings-bootstrap.test.ts --run

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Summary by cubic

Remove the retired bundled Windsurf plugin on startup and block it from loading. Prevents stale windsurf code from old installs from being discovered and run; custom plugins are untouched.

• Bug Fixes
  • On startup, delete app_data/plugins/windsurf only if its manifest id is windsurf.
  • Filter retired bundled plugin IDs from loading as a safety net.
  • Added regression tests for upgraded installs and legacy/mismatched directories.

^{Written for commit ad4e69a. Summary will update on new commits.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/remove-retired-windsurf-plugin

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