feat: advertise the pinned artifact version in get_preview_status (#10691)

* test: let global evals seed the session's preview tabs

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* feat: advertise the pinned artifact version in get_preview_status

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* test: reject ambiguous preview-tab and artifact eval fixtures

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

.github/workflows/ai-evals-test.yml

@@ -22,6 +22,7 @@ on:
       - "frontend/src/lib/userDraft.svelte.ts"
       - "frontend/src/lib/userDraftDbSyncer.svelte.ts"
       - "frontend/src/lib/infer.ts"
+      - "frontend/src/lib/components/sessions/**"
       - ".github/workflows/ai-evals-test.yml"
   pull_request:
     types: [opened, reopened, ready_for_review]
@@ -35,6 +36,7 @@ on:
       - "frontend/src/lib/userDraft.svelte.ts"
       - "frontend/src/lib/userDraftDbSyncer.svelte.ts"
       - "frontend/src/lib/infer.ts"
+      - "frontend/src/lib/components/sessions/**"
       - ".github/workflows/ai-evals-test.yml"
 
 concurrency:
@@ -124,6 +126,11 @@ jobs:
           bun install
           bun test adapters/
 
+      # Harness code that reaches into the frontend module graph; bun cannot load it.
+      - name: Run harness unit tests (frontend graph)
+        working-directory: ./ai_evals
+        run: bun run test:frontend-graph
+
       - name: Run global AI evals
         timeout-minutes: 20
         working-directory: ./ai_evals