Add executor capability discovery V2 infrastructure - #47683
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## What changed - Define `capabilities/discoverV2` request and inventory types and advertise `capabilityDiscoveryV2` in executor metadata. - Prewarm installed plugin and global skill locations at server startup, with nonfatal scan failures. - Add sandbox-scoped discovery caching with file watcher invalidation and request-time reloads when watching is unavailable. - Batch metadata reads through the filesystem sandbox helper and bound discovery responses to 4 MiB and 2,048 capabilities. - Share plugin identity and installed-version selection in `codex-core-plugin-common`, and fall back to `.app.json` when a plugin does not declare an apps configuration. The V2 discovery manager is not yet wired into RPC request dispatch. ## Testing Add coverage for inventory metadata, sandbox cache isolation, watcher invalidation, startup scan failures, response limits, and compatibility with older executor metadata. GitOrigin-RevId: a223a5bc15fdf251023c0c71f468fd92c3b2d847
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Add executor capability discovery V2 infrastructure
What changed
capabilities/discoverV2request and inventory types and advertisecapabilityDiscoveryV2in executor metadata.codex-core-plugin-common, and fall back to.app.jsonwhen a plugin does not declare an apps configuration.The V2 discovery manager is not yet wired into RPC request dispatch.
Testing
Add coverage for inventory metadata, sandbox cache isolation, watcher invalidation, startup scan failures, response limits, and compatibility with older executor metadata.