Gateway Hot-Reload Improvements

This cluster of pull requests focuses on enhancing the gateway's hot-reload capabilities and addressing related issues to improve agent management.

12 PRs

fix heartbeat config Representative: #8473

#	Title	Author	Created	GitHub
4108	gateway: hot-reload heartbeat when agents.list changes	jifanchn	2026-01-29	View
7128	feat: add gateway.restart RPC for graceful in-process restart	AkashaBot	2026-02-02	View
7747	Gateway: add zero-latency hot-reload for agent bindings	NikolasP98	2026-02-03	View
8473	fix(gateway): prevent spurious restarts on meta.lastTouchedAt changes rep	adam-smeth	2026-02-04	View
9040	fix(security): throw on config validation failure instead of returning empty ...	joetomasone	2026-02-04	View
11280	fix(gateway): add meta prefix to reload rules to prevent double SIGUSR1	cheenu1092-oss	2026-02-07	View
11746	fix: treat meta config paths as no-op to prevent unnecessary gateway restarts	QDenka	2026-02-08	View
13408	fix(gateway): skip SIGUSR1 restart in config.patch for noop reload rules	rwmjhb	2026-02-10	View
20355	fix(gateway): enforce commands.restart guard for config.apply and config.patch	Clawborn	2026-02-18	View
22720	fix: notify sessions on invalid config during hot-reload	jayleekr	2026-02-21	View
22858	Gateway: add eager secrets runtime snapshot activation	joshavant	2026-02-21	View
22980	Gateway: add manual secrets reload command	joshavant	2026-02-21	View