fix(worker): harden control-plane lifecycle

- reconnect safely after token rotation and retry leased results
- reject malformed tasks and remove production cluster debug mutation
- validate environment files and require immutable container images

BREAKING CHANGE: Docker install, deploy, and Compose now require an
immutable repository@sha256 image reference.

cmd/rsmon-worker/main.go

@@ -15,7 +15,6 @@ import (
 	"syscall"
 	"time"
 
-	"github.com/hashicorp/raft"
 	"github.com/joho/godotenv"
 
 	"rocketgit.ru/rsmon/worker/internal/distworker"
@@ -33,19 +32,6 @@ var (
 	// Phase 1 keeps it on; the flag exists so a Phase 2 basic-auth
 	// install can opt out without recompiling.
 	webappEnabled = true
-
-	// clusterDebugApplyTestConfig, when true, submits the hardcoded
-	// CriticalCheckConfig from workercluster.DefaultDebugCriticalCheck
-	// to the cluster on startup. Wired via the
-	// --cluster-debug-apply-test-config CLI flag; the e2e script
-	// uses this so it can verify FSM replication without the
-	// signed-config-adoption producer (which lands in a later phase).
-	//
-	// DEBUG: this flag is a placeholder. It must be removed (or
-	// guarded behind a build tag) before any production build.
-	//
-	// TODO(phase-N): remove once the real producer is wired.
-	clusterDebugApplyTestConfig = false
 )
 
 func main() {
@@ -57,8 +43,6 @@ func main() {
 
 	versionFlag := flag.Bool("version", false, "Print version and exit")
 	noWeb := flag.Bool("no-web", false, "Disable the local web UI (Phase 1 ships with it on)")
-	debugApplyConfig := flag.Bool("cluster-debug-apply-test-config", false,
-		"Submit a hardcoded CriticalCheckConfig to the cluster on startup. DEBUG: remove once the real config.adopt producer is wired.")
 	flag.Parse()
 
 	if *versionFlag {
@@ -66,7 +50,6 @@ func main() {
 		os.Exit(0)
 	}
 	webappEnabled = !*noWeb
-	clusterDebugApplyTestConfig = *debugApplyConfig
 
 	if len(flag.Args()) > 0 && flag.Arg(0) == "health" {
 		os.Exit(healthCheck())
@@ -295,46 +278,12 @@ func buildCluster(ctx context.Context, cfg *distworker.Config) (*workercluster.C
 	log.Printf("worker cluster: started node_id=%s addr=%s bootstrap=%t peers=%d",
 		nodeID, localAddr, bootstrap, len(peers))
 
-	if clusterDebugApplyTestConfig && bootstrap {
-		// The debug apply only fires on bootstrap nodes; a
-		// joiner cannot commit a log entry until it has been
-		// promoted to voter. Wait for this node to win an
-		// election first (a fresh single-voter cluster elects
-		// itself immediately but the goroutine may run before
-		// the state has flipped).
-		go func() {
-			deadline := time.Now().Add(15 * time.Second)
-			for time.Now().Before(deadline) {
-				if c.Raft() != nil && c.Raft().State() == raft.Leader {
-					break
-				}
-				time.Sleep(100 * time.Millisecond)
-			}
-			if c.Raft() == nil || c.Raft().State() != raft.Leader {
-				log.Printf("worker cluster: applying debug test config id=%d: not leader after 15s",
-					workercluster.DefaultDebugCriticalCheck().ID)
-				return
-			}
-			check := workercluster.DefaultDebugCriticalCheck()
-			applied, err := c.ApplyTestConfig(&check)
-			if err != nil {
-				log.Printf("worker cluster: applying debug test config id=%d: %v",
-					check.ID, err)
-				return
-			}
-			log.Printf("worker cluster: applying debug test config id=%d applied_index=%d",
-				check.ID, applied)
-		}()
-	}
-
 	return c, &clusterAdapter{c: c}, nil
 }
 
 // clusterAdapter wraps *workercluster.Cluster so it implements the
 // webapp.ClusterView interface without webapp importing the raft
-// code path. The ApplyTestConfig signature is the one webapp expects
-// (no config argument; the cluster subsystem owns the hardcoded
-// payload so the two sides cannot drift).
+// code path.
 type clusterAdapter struct {
 	c *workercluster.Cluster
 }
@@ -359,11 +308,6 @@ func (a *clusterAdapter) Stats() webapp.ClusterStats {
 	}
 }
 
-func (a *clusterAdapter) ApplyTestConfig() (uint64, error) {
-	check := workercluster.DefaultDebugCriticalCheck()
-	return a.c.ApplyTestConfig(&check)
-}
-
 func (a *clusterAdapter) ClusterID() string { return a.c.ClusterID() }
 func (a *clusterAdapter) LocalAddr() string { return a.c.LocalAddr() }
 
@@ -528,13 +472,17 @@ func (w runnerWrapper) RecentNotifications(n int) []webapp.NotificationRow {
 	out := make([]webapp.NotificationRow, len(src))
 	for i, r := range src {
 		out[i] = webapp.NotificationRow{
-			Kind:    r.Kind,
-			Channel: r.Channel,
-			Subject: r.Subject,
-			Body:    r.Body,
-			OK:      r.OK,
-			Error:   r.Error,
-			At:      r.At,
+			Kind:       r.Kind,
+			Channel:    r.Channel,
+			Subject:    r.Subject,
+			Body:       r.Body,
+			OK:         r.OK,
+			Error:      r.Error,
+			At:         r.At,
+			JobID:      r.JobID,
+			Method:     r.Method,
+			Status:     r.Status,
+			DurationMs: r.DurationMs,
 		}
 	}
 	return out