feat(m7-amend2): implicit lifecycle — writes drive state, no workflow UI

User: «Enlève également le workflow d'un test, quand on saisit des
informations côtés redteam cela signifie qu'il a été exécuté et donc
en attente d'une review blueteam.»

Backend (update_mission_test_fields)
- At the end of every PUT, inspect the touched-field set:
  - any red write on state in {pending, skipped, blocked} → state=executed
    + auto-stamp executed_at=now() if absent
  - any blue write on state=executed → state=reviewed_by_blue
- /transition endpoint kept for back-fill/admin use, not called from UI.

Frontend MissionTestPage
- Removed the transition-buttons header block and the `transition`
  mutation. State pill stays as a passive indicator.
- New labels: "Not started" / "Awaiting review" / "Reviewed" describe
  the implicit lifecycle, no longer exposing the state-machine concept.

E2E
- The SPA test that clicked `transition-executed` now verifies the
  implicit promotion: typing red fields and saving flips the pill from
  "Not started" → "Awaiting review", no button click required.

Spec
- §4 reword: "Cycle de vie implicite, piloté par les écritures" replaces
  the old "Workflow par test instance" bullet.

Tests
- 3 new pytest: red_command-alone implicit execute + auto-stamp,
  blue write promotes executed→reviewed, blue write on pending no-op.
- 142 pytest + 49 Playwright green.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/lib/missions.ts

@@ -315,9 +315,12 @@ export const EVIDENCE_ALLOWED_EXTENSIONS = [
 
 export const EVIDENCE_MAX_BYTES = 25 * 1024 * 1024;
 
+// Post-amendement 2026-05-15 bis: the explicit workflow is gone from the
+// UI — the state column survives in the DB but the labels describe the
+// implicit lifecycle (driven by which side has written data).
 export const MISSION_TEST_STATE_LABEL: Record<MissionTestState, string> = {
-  pending: 'Pending',
-  executed: 'Executed',
+  pending: 'Not started',
+  executed: 'Awaiting review',
   reviewed_by_blue: 'Reviewed',
   skipped: 'Skipped',
   blocked: 'Blocked',

frontend/src/pages/MissionTestPage.tsx

@@ -28,21 +28,13 @@ import { Card } from '@/components/ui/Card';
 import { SectionHeader } from '@/components/ui/SectionHeader';
 import { Tag } from '@/components/ui/Tag';
 import { TextField } from '@/components/ui/TextField';
-import {
-  ApiError,
-  apiDelete,
-  apiFetch,
-  apiGet,
-  apiPost,
-  apiPut,
-} from '@/lib/api';
+import { ApiError, apiDelete, apiFetch, apiGet, apiPut } from '@/lib/api';
 import { useAuth } from '@/lib/auth';
 import {
   EVIDENCE_ALLOWED_EXTENSIONS,
   EVIDENCE_MAX_BYTES,
   MISSION_TEST_STATE_ACCENT,
   MISSION_TEST_STATE_LABEL,
-  VALID_TEST_TRANSITIONS,
   missionKeys,
   missionTestKeys,
   type ActivityResponse,
@@ -50,7 +42,6 @@ import {
   type DetectionLevelList,
   type MissionTestDetail,
   type MissionTestEvidence,
-  type TestTransitionPayload,
   type UpdateMissionTestPayload,
 } from '@/lib/missions';
 
@@ -624,18 +615,6 @@ export function MissionTestPage() {
 
   useActivityWatcher(missionId, testId, onActivityTouched);
 
-  const transition = useMutation({
-    mutationFn: (body: TestTransitionPayload) =>
-      apiPost<MissionTestDetail>(
-        `/missions/${missionId}/tests/${testId}/transition`,
-        body,
-      ),
-    onSuccess: (next) => {
-      qc.setQueryData(missionTestKeys.detail(missionId, testId), next);
-      qc.invalidateQueries({ queryKey: missionKeys.detail(missionId) });
-    },
-  });
-
   const test = detail.data;
 
   const perms = useMemo(() => {
@@ -667,10 +646,6 @@ export function MissionTestPage() {
     return <Alert accent="red">Failed to load mission test.</Alert>;
   }
 
-  const allowedTransitions = VALID_TEST_TRANSITIONS[test.state] ?? [];
-  const transitionErr =
-    transition.error instanceof ApiError ? transition.error : null;
-
   return (
     <div className="flex flex-col gap-4" data-testid="mission-test-page">
       <div className="flex flex-wrap items-baseline justify-between gap-2">
@@ -693,37 +668,18 @@ export function MissionTestPage() {
               : ''}
           </p>
         </div>
+        {/* Post-amendement 2026-05-15 bis: no transition buttons. The pill
+            is a passive indicator of where the implicit lifecycle stands
+            (driven by who has written data). */}
         <div className="flex flex-wrap items-center gap-2">
           <span data-testid="state-pill">
             <Tag accent={MISSION_TEST_STATE_ACCENT[test.state]}>
               {MISSION_TEST_STATE_LABEL[test.state]}
             </Tag>
           </span>
-          {allowedTransitions.map((target) => (
-            <Button
-              key={target}
-              accent={MISSION_TEST_STATE_ACCENT[target]}
-              variant="ghost"
-              onClick={() => transition.mutate({ target_state: target })}
-              disabled={transition.isPending}
-              data-testid={`transition-${target}`}
-            >
-              → {MISSION_TEST_STATE_LABEL[target]}
-            </Button>
-          ))}
         </div>
       </div>
 
-      {transitionErr && (
-        <Alert accent="red">
-          {transitionErr.payload &&
-          typeof transitionErr.payload === 'object' &&
-          'message' in (transitionErr.payload as Record<string, unknown>)
-            ? `${transitionErr.message} — ${(transitionErr.payload as { message?: string }).message}`
-            : transitionErr.message}
-        </Alert>
-      )}
-
       <Card className="flex flex-col gap-2">
         <div className="flex flex-wrap gap-2">
           {test.mitre_tags.map((tag) => (