Session Lock Improvements

This cluster focuses on fixing race conditions and enhancing session lock management within the framework.

13 PRs

fix sessions Representative: #10725

#	Title	Author	Created	GitHub
4044	fix: release session locks on SIGUSR1 restart + instance nonce for stale dete...	seanb4t	2026-01-29	View
4664	fix: per-session metadata files to eliminate lock contention	tsukhani	2026-01-30	View
5014	fix(agents): detect PID reuse in session write lock	shayan919293	2026-01-30	View
10283	fix(agents): close TOCTOU race in session write lock acquisition	programming-pupil	2026-02-06	View
10725	fix: re-read session store inside lock in updateSessionStoreEntry rep	Yida-Dev	2026-02-06	View
10726	fix: re-read session store inside lock in updateLastRoute	Yida-Dev	2026-02-06	View
15628	fix: resolve session write lock race condition	1kuna	2026-02-13	View
15882	fix: move session entry computation inside store lock to prevent race conditions	cloorus	2026-02-14	View
16987	fix(config): add skipCache to updateSessionStoreEntry and updateLastRoute to ...	AI-Reviewer-QS	2026-02-15	View
20431	fix(sessions): add session contamination guards and self-leak lock detection	marcomarandiz	2026-02-18	View
21828	fix: acquire session write lock in delivery mirror and gateway chat paths	inkolin	2026-02-20	View
23557	fix: catch session JSONL write failures instead of crashing	Joe3112	2026-02-22	View
23583	fix(agents): catch session JSONL write failures instead of crashing	mohandshamada	2026-02-22	View