fix(lifecycle): own enrichment provenance in code; fix(mailbox-poller): drop numeric separators

apps/lifecycle/src/campaign/send.spec.ts

@@ -248,6 +248,40 @@ describe('prepareCampaignMessage', () => {
     ).toMatchObject({ status: 'ready', subject: 'A practical place to start' });
   });
 
+  it('closes the sequence on the final step even when evidence copy is selected', () => {
+    const cited = artifact({
+      cited_signals: [
+        { signal: 'Bounded source fact', source_ids: ['source-1'] },
+      ],
+      sources: [
+        {
+          id: 'source-1',
+          url: 'https://example.com/about',
+          retrieved_at: '2026-09-01T12:00:00.000Z',
+          content_hash: 'a'.repeat(64),
+        },
+      ],
+      drafts: [
+        { angle_id: 'streaming_foundation', source_id: 'source-1' },
+        { angle_id: 'debugging_layers', source_id: 'source-1' },
+        { angle_id: 'event_state_boundary', source_id: 'source-1' },
+      ],
+    });
+
+    const message = prepareCampaignMessage({
+      context: context({ enrichmentArtifact: cited }),
+      job: job('send_step', { campaign_version: 'v1', step: 3 }),
+      now: new Date('2026-09-09T12:05:00.000Z'),
+      unsubscribeUrl: UNSUBSCRIBE,
+    });
+
+    expect(message).toMatchObject({
+      status: 'ready',
+      subject: 'One event-state boundary',
+    });
+    expect(JSON.stringify(message)).toContain('last automated follow-up');
+  });
+
   it('falls back per fixed step when an artifact draft violates copy checks', () => {
     const invalid = artifact({
       drafts: [

apps/lifecycle/src/campaign/send.ts

@@ -240,7 +240,9 @@ function draftFor(
         source_ids.includes(selection.source_id)
       );
     if (selection !== null && cited) {
-      return renderEvidenceCampaignTemplate(selection.angle_id);
+      return renderEvidenceCampaignTemplate(selection.angle_id, {
+        finalStep: step === 3,
+      });
     }
   }
   return renderCampaignTemplate(STEP_NAMES[step]);

apps/lifecycle/src/campaign/templates.spec.ts

@@ -4,6 +4,7 @@ import {
   campaignDraftViolations,
   normalizeCampaignDraft,
   renderCampaignTemplate,
+  renderEvidenceCampaignTemplate,
 } from './templates.js';
 
 function wordCount(value: string): number {
@@ -34,6 +35,20 @@ describe('renderCampaignTemplate', () => {
     );
   });
 
+  it('appends the last-follow-up notice to an evidence template only for the final step', () => {
+    const final = renderEvidenceCampaignTemplate('event_state_boundary', {
+      finalStep: true,
+    });
+    const earlier = renderEvidenceCampaignTemplate('event_state_boundary');
+
+    expect(final.body).toContain('last automated follow-up');
+    expect(final.body.endsWith('This is my last automated follow-up.')).toBe(
+      true
+    );
+    expect(campaignDraftViolations(final)).toEqual([]);
+    expect(earlier.body).not.toContain('last automated follow-up');
+  });
+
   it('rejects an unknown campaign step at runtime', () => {
     expect(() => renderCampaignTemplate('day-30' as never)).toThrow();
   });

apps/lifecycle/src/campaign/templates.ts

@@ -194,8 +194,16 @@ export function renderCampaignTemplate(step: CampaignStep): CampaignDraft {
   return normalizeCampaignDraft(CAMPAIGN_TEMPLATES[parsedStep]);
 }
 
+const FINAL_STEP_NOTICE = 'This is my last automated follow-up.';
+
 export function renderEvidenceCampaignTemplate(
-  angle: CampaignEvidenceAngle
+  angle: CampaignEvidenceAngle,
+  options: { finalStep?: boolean } = {}
 ): CampaignDraft {
-  return normalizeCampaignDraft(EVIDENCE_TEMPLATES[angle]);
+  const template = EVIDENCE_TEMPLATES[angle];
+  return normalizeCampaignDraft(
+    options.finalStep
+      ? { ...template, body: `${template.body}\n\n${FINAL_STEP_NOTICE}` }
+      : template
+  );
 }