feat(v0.156.0): dead-primary alerting (R-51) + boot desired-state reconciliation (R-52)

R-51: aggregateState's mixed branch returned StateRunning ("partial"), so a stack whose
MAIN container was dead behind live helpers alerted on nothing — immich-server sat Exited
for 18 h, 100 % unreachable, no banner and no app_start_failed (audit F4). New
StateDegraded: a DOWN member whose docker restart policy is always/unless-stopped is a
fault (degraded, a down state); no/on-failure is a finished one-shot and stays benign; an
unreadable policy fails CLOSED. The unhealthy/restarting/paused/unknown exclusions are
byte-identical — folding unhealthy into down is the flapping fix-3 avoided.

R-52: new internal/bootrecon — one bounded start-once sweep at startup (2 attempts, 30 s
apart) for apps an interrupted boot left behind, inside the 90 s boot grace so a success
is silent and a failure still alerts. A zero-container stack is NEVER touched: the UI's
Stop is compose down, so a deliberate stop survives a reboot.

Both features carry a production-path wiring test (the v0.154.0 / v0.91.0 inert-seam
class). The main() assertion is an AST walk, not strings.Contains — the substring version
passed its own red-proof, because a commented-out call still contains the string.

Red-proofs run and restored: mix branch reverted -> "running" on the immich fixture;
boot hook commented out -> wiring test fails; zero-container gate dropped -> the
user-stopped app gets started.

NOTE: controller/cmd/controller/ is matched by .gitignore's `controller` entry, so new
files there need `git add -f` (and ripgrep silently skips main.go without --no-ignore).

controller/internal/web/handlers.go

@@ -148,7 +148,9 @@ func (s *Server) dashboardHandler(w http.ResponseWriter, r *http.Request) {
 		switch st.State {
 		case stacks.StateRunning, stacks.StateStarting, stacks.StateUnhealthy, stacks.StateRestarting:
 			running++
-		case stacks.StateStopped, stacks.StateExited:
+		// R-51: degraded counts with stopped — the dashboard counter answers "how many of my apps
+		// work", and a stack with a dead supervised member does not.
+		case stacks.StateStopped, stacks.StateExited, stacks.StateDegraded:
 			stopped++
 		}
 	}