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## Why Plugins can bundle lifecycle hooks, but Codex previously only discovered hooks from user, project, and managed config layers. This adds the plugin discovery and runtime plumbing needed for plugin-bundled hooks while keeping execution behind the `plugin_hooks` feature flag. ## What - Discovers plugin hook sources from each plugin's default `hooks/hooks.json`. - Supports `plugin.json` manifest `hooks` entries as either relative paths or inline hook objects. - Plumbs discovered plugin hook sources through plugin loading into the hook runtime when `plugin_hooks` is enabled. - Marks plugin-originated hook runs as `HookSource::Plugin`. - Injects `PLUGIN_ROOT` and `CLAUDE_PLUGIN_ROOT` into plugin hook command environments. - Updates generated schemas and hook source metadata for the plugin hook source. ## Stack 1. This PR - openai/codex#19705 2. openai/codex#19778 3. openai/codex#19840 4. openai/codex#19882 ## Reviewer Notes - Core logic is in `codex-rs/core-plugins/src/loader.rs` and `codex-rs/hooks/src/engine/discovery.rs` - Moved existing / adding new tests to `codex-rs/core-plugins/src/loader_tests.rs` hence the large diff there - Otherwise mostly plumbing and minor schema updates ### Core Changes The `codex-rs/core` changes are limited to wiring plugin hook support into existing core flows: - `core/src/session/session.rs` conditionally pulls effective plugin hook sources and plugin hook load warnings from `PluginsManager` when `plugin_hooks` is enabled, then passes them into `HooksConfig`. - `core/src/hook_runtime.rs` adds the `plugin` metric tag for `HookSource::Plugin`. - `core/config.schema.json` picks up the new `plugin_hooks` feature flag, and `core/src/plugins/manager_tests.rs` updates fixtures for the added plugin hook fields. --------- Co-authored-by: Codex <noreply@openai.com>