feat(plugins): hot-reload agent plugins - #73
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Summary
Kit hot-reloads Agent Plugin configuration and packages at live tool and serialized user-prompt boundaries while retaining the last valid generation after invalid updates. Plugin-provided MCP servers and skills are published atomically; the stable skill callable remains actionable even when a session started with no available skills.
Technical details
Stable generation publication
Slow MCP initialization and source preparation happen before the short publication lock. Concurrent skill catalog reads continue using the last published snapshot, while invocations retain generation leases for snapshot-backed resources.
Unchanged source reuse
Bounded deterministic fingerprints avoid rebuilding unchanged local packages, immutable archives, and commit-pinned Git sources. Mutable Git names and default
HEADuse hardened remote object-ID probes and perform a full fetch only after the selected commit changes.Private atomic staging
Plugin snapshots and archive verification use the shared private staging-directory lifecycle for stale cleanup, containment validation, race-safe publication, and cleanup.
Closes #70