Adds prod/docs/WATCHDOG_GHOST_SUBSCRIPTION_SELF_RESTART.md: the 2026-09-16 04:10:40
r27 ghost-subscription wedge (empty data after 04:08 WS reconnect), the log-only
-> self-restart (b) promotion via the watchdog_decision seam, the guard contract
(acc_age>=900s, uptime>600s, probe-not-None), the 51-test suite, mutation-litmus
results, operational status (pid 3506857 still pre-fix; restart safe per
AGENTS.md BLUE=flat-venue).