feat(cv): Phase 2.1-b — extract Projects, Certifications, and languages-from-prose

The structured model and StructuredCvProfileJson.FromSections already map
Projects/Certifications/Languages headings, but the AI normalize prompt
never emitted them, so on the benchmark CV the entire Projects section and
the in-summary languages (English Native, Norwegian B1) were silently
dropped. This closes that gap upstream — no backend schema or data change.

ai-service (tools/summarizer/app.py):
- /cv/normalize: added # Projects and # Certifications headings; a
  languages-from-prose rule (pull "native English", "Norwegian at B1" out
  of the summary even with no Languages section; ignore programming
  languages); and skill-group prefix stripping ("Development:",
  "DevOps & Infrastructure:", "Practices:" dropped, only the skills kept).
- /cv/classify-block: Projects and Certifications added to the section
  enum + rules (fallback path).

Backend:
- LooksLikeNormalizedMarkdownCv now recognises # Projects / # Certifications
  so those CVs still take the markdown assembly path.

Tests:
- CvExtractionCoverageTests (4) lock the C# mapping of Projects,
  Certifications and Languages sections into the structured profile.
- ai-service test_classify_block_supports_projects_section (1).
426 backend tests, 17 ai-service tests pass; app.py compiles.

The LLM behaviour (prompt -> headings) needs Ollama to observe and was not
run here; the C# side that consumes the headings is proven and the prompt
change is additive. Merge-not-replace + the review screen are the next
increment (2.1-a, approved: always-review, conservative merge).

Deployment: these prompts live in the ai-service container, which
deploy.sh does not rebuild by default -- deploy with
DEPLOY_BUILD_AI_SERVICE=true or the change won't take effect.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tools/summarizer/tests/test_app.py

@@ -134,6 +134,38 @@ def test_classify_block_returns_structured_json(monkeypatch):
     assert payload["skills"] == ["Python", "SQL"]
 
 
+def test_classify_block_supports_projects_section(monkeypatch):
+    # Phase 2.1-b: Projects and Certifications are now valid classified sections so project blocks
+    # (e.g. the benchmark CV's JobTrack/InboxIntel) are no longer dropped into "Other".
+    module = load_app_module(monkeypatch)
+
+    def fake_generate_json(prompt: str):
+        assert "Projects" in prompt  # the enum now advertises Projects to the model
+        return {
+            "section": "Projects",
+            "confidence": 0.83,
+            "reason": "project block",
+            "title": "JobTrack",
+            "company": None,
+            "location": None,
+            "start": None,
+            "end": None,
+            "bullets": ["Full-stack job-application tracker (React, ASP.NET Core, SQLite, Docker)."],
+            "summary": [],
+            "skills": [],
+        }
+
+    monkeypatch.setattr(module, "_ollama_generate_json", fake_generate_json)
+    client = TestClient(module.app)
+
+    response = client.post("/cv/classify-block", json={"block": "JobTrack - Full-stack job-application tracker (React, ASP.NET Core, SQLite, Docker)."})
+
+    assert response.status_code == 200
+    payload = response.json()
+    assert payload["section"] == "Projects"
+    assert payload["title"] == "JobTrack"
+
+
 def test_classify_block_defaults_missing_section_to_other(monkeypatch):
     module = load_app_module(monkeypatch)
     monkeypatch.setattr(module, "_ollama_generate_json", lambda prompt: {"bullets": []})