feat(core): catalog plugin resource events

[dcramer]

Plugins can now declare structured resource types with supported and suggested events. Core derives each plugin's namespace, validates published and selected events against the active runtime catalog, and exposes searchResourceEventTypes so the agent can discover the event capabilities that are actually enabled.

Temporary resource watches now use the same namespace + resource type + identifier + event type contract. watchResourceEvents validates selections against the catalog, reports its expiry, and supports exact cancellation by watch ID. GitHub and Vercel publishers are migrated to the contract; GitHub additionally publishes exact-issue and repository-wide issue events.

This is a hard cutover from provider / resourceRef. Existing short-lived Redis watch records remain under the old prefix and expire naturally rather than being migrated. This PR does not add durable event-task persistence or execution; that work will build on this catalog in a separate PR.

Refs #1174

[vercel]

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Project	Deployment	Actions	Updated (UTC)
junior-docs	Ready	Preview	Aug 2, 2026 5:35am

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