## Context
The installed-app suggestion expansion added in #24996 reads plugin
details for trusted file-backed marketplace candidates because the list
response does not include app ids. On Windows-backed WSL mounts, the
local `openai-curated` checkout lives under `$CODEX_HOME/.tmp/plugins`,
and those per-plugin detail reads can be very slow.
Remote curated already has cached app ids, so it does not need the same
local filesystem traversal.
## Summary
- Keep only the WSL Windows-backed local `openai-curated` checkout on
the legacy fallback/configured discovery path.
- Preserve installed-app expansion for non-WSL file-backed marketplaces
and remote curated.
- Add focused tests for the WSL local curated path predicate.
## Test
- `just test -p codex-core-plugins discoverable`
- `just test -p codex-core plugins::discoverable::tests`
xl-openai