[ump45nose]

Add optional --stall-after-ms / MCP stallAfterMs to Thread watches. A running Thread that produces no observed Harness activity emits one advisory alert per silence episode while its watch remains active; new activity, including known descendants, resets the clock.

Activity and pending stall alerts stay in memory. Restarting restores the watch and its threshold, then starts a fresh silence interval. Closed native ancestors are retained only while open descendants still report through them. Persisted watch adoption reuses the Host filesystem lock per record so concurrent Hosts cannot both adopt it.

Validation: typecheck, lint, 173 focused tests across 10 watch/CLI/MCP/event/persistence/activity suites, and 32 adoption/restart tests passed.

CI passed Linux x64, Linux ARM64 and Windows. macOS failed the unchanged Web relay HTTP/2 test serves authenticated h2 RPC, compressed assets, uploads and live events on one relay connection with ERR_HTTP2_INVALID_SESSION. This PR changes neither Web Server nor Remote Relay. Retrying the failed job through the GitHub integration returned HTTP 403 (Resource not accessible by integration), so this PR remains a draft pending CI confirmation.

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[ump45nose]

Merged current main (1a239fdc, including #776 / #788) into this branch to clear the conflict. Head is now cc0080f5 (cc0080f5d29fd9f9e3fa0ebb277b88453a6699a9).

The only conflict was in packages/host-runtime/src/app-server-host.ts. The merge uses main's sharedDelegationRegistration wrapper and keeps this branch's subscribeActivity hook on the local registration (sharedDelegationRegistration already spreads the local object, so the hook is preserved).

Locally on this head: vitest run packages/host-runtime/test/app-server-host.watch.test.ts packages/host-runtime/test/delegation-control-registry.test.ts is 29 passed; 0 failed.

(AI-assisted reply.)