fix(ui): explain missing worktree seed provenance

Co-Authored-By: Paperclip <noreply@paperclip.ing>

ui/src/components/WorktreeRunEngineBanner.test.tsx

@@ -115,6 +115,12 @@ describe("WorktreeRunEngineBanner", () => {
     expect(container.textContent).toContain("Toggle it off and back on");
   });
 
+  it("explains a missing seed epoch", () => {
+    const container = mount(suppressed("missing_seed_epoch"));
+    expect(container.textContent).toContain("missing seed epoch");
+    expect(container.textContent).toContain("Toggle off and back on");
+  });
+
   it("explains a flag-disabled run engine", () => {
     const container = mount(suppressed("flag_disabled"));
     expect(container.textContent).toContain("Run engine off");
@@ -134,8 +140,8 @@ describe("WorktreeRunEngineBanner", () => {
     expect(strip?.textContent).toContain("5 inherited runs inactive");
   });
 
-  // PAP-14415: the strip supplies its own bold "Run engine" subject, so the
-  // suppressed predicate must not restate it (no "Run engine run engine off").
+  // The strip supplies its own bold "Run engine" subject, so the suppressed
+  // predicate must not restate it (no "Run engine run engine off").
   it("does not stutter the run-engine subject in the suppressed strip", () => {
     const container = mount(suppressed("flag_disabled", { quarantinedRunCount: 4 }), "strip");
     const text = container

ui/src/components/WorktreeRunEngineBanner.tsx

@@ -58,6 +58,13 @@ function suppressionCopy(
           "This worktree has not stamped an instance identity yet, so execution fails closed. Toggle off and back on to arm execution.",
         stripLabel: "suppressed — no identity",
       };
+    case "missing_seed_epoch":
+      return {
+        headline: "Execution suppressed — missing seed epoch",
+        detail:
+          "This worktree has no seed epoch stamped yet, so execution fails closed. Toggle off and back on to arm execution.",
+        stripLabel: "suppressed — missing seed epoch",
+      };
     case "instance_id_mismatch":
       return {
         headline: "Toggle inactive — bound to another instance",