feat: lint reports sections that hold only template placeholders as Unfilled Template Sections (#94)

Files changed:
- CHANGES.md
- EVALS.md
- VERSION
- instructions/wiki-lint/SKILL.md
- instructions/wiki-manage/SKILL.md
- tools/CONTRACT.md
- tools/chemenu/blocks.py
- tools/chemenu/commands/lint.py
- tools/chemenu/evals/scorecard.py
- tools/chemenu/lint_core.py
- tools/chemenu/tests/test_blocks.py
- tools/chemenu/tests/test_evals.py
- tools/chemenu/tests/test_lint.py
- tools/chemenu/tests/test_pipeline_l0.py
- types/type-spec.md

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

tools/chemenu/tests/test_pipeline_l0.py

@@ -96,6 +96,8 @@ def test_a_scaffolded_page_is_not_yet_a_finished_one(empty_kb):
     assert report["broken_links"], \
         "the scaffold no longer carries placeholder links - update this test"
     assert {f["page"] for f in report["broken_links"]} == {"Scaffold Only"}
+    assert [f["page"] for f in report["unfilled_sections"]] == ["Scaffold Only"], \
+        "the scaffold no longer marks its placeholders with TODO - see types/type-spec.md"
 
 
 def test_a_wiki_built_by_the_tools_lints_clean(empty_kb):