Run allowlisted executor plugin stop hooks (#40009)

## What changed

- Discover inline hooks from executor-provided plugin manifests and accept only
  the bundled Computer Use `Stop` hook for `node_repl.turn_ended`.
- Add the accepted hook to the current step's hook engine with
  executor-scoped provenance.
- Run executor-scoped hooks in the background after regular stop-hook
  decisions, without delaying turn completion, applying control effects, or
  exposing them in hook summaries. Skip them when regular hooks only block
  continuation.

## Testing

- Added coverage for manifest filtering and option preservation.
- Added coverage for background execution, interaction with regular stop
  hooks, and non-blocking turn completion.

GitOrigin-RevId: c0f75f83a23ba8a83bb3a5d5997c4882aacc32d6

codex-rs/hooks/Cargo.toml

@@ -21,6 +21,7 @@ codex-plugin = { workspace = true }
 codex-protocol = { workspace = true }
 codex-utils-absolute-path = { workspace = true }
 codex-utils-output-truncation = { workspace = true }
+codex-utils-path-uri = { workspace = true }
 futures = { workspace = true, features = ["alloc"] }
 regex = { workspace = true }
 schemars = { workspace = true }