9a755822eb
- Added bounded SIGINT escalation with `requestCancel()` to force kernel shutdown after 2s. - Removed executor idle-timeout, max-session, heartbeat, and deferred disposal-retry logic. - Added per-session `runQueued()` execution and dead-kernel restart retry flow for owned sessions. - Replaced kernel session tracking with reusable `sessions` map and `acquireSession()` ownership registration. - Removed obsolete owner-cleanup session-capacity tests and updated dead-session mocks to resolver-based flow.