cli: make bundled help self-describing

packages/inbox-runtime/internal/cli/inbox/claim.go

@@ -22,6 +22,14 @@ func newClaimCmd(root *rootOptions) *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "claim",
 		Short: "Acquire a lease on a pending thread",
+		Long: helpLong(
+			"Use claim to acquire the active worker lease for one thread.",
+			"claim is the step that turns a candidate thread into owned work.",
+			"After claim, the worker should inspect the thread, send an in_progress update when real work starts, and finish with done or fail.",
+			"Only one active lease may exist per thread at a time.",
+		),
+		Example: `  inbox --db .agents/coord.db claim --agent worker-a --thread thr_123
+  inbox --db .agents/coord.db claim --agent worker-a --thread thr_123 --lease-seconds 1800`,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			ctx := cmd.Context()