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

EVALS.md

@@ -330,7 +330,8 @@ giving it its own runner would have duplicated the suite to no end.
 
 One behaviour it pins is easy to mistake for a defect: **a scaffolded page does not lint
 clean**. `new` writes placeholder wikilinks for the author to replace, so a page that was
-created but not yet written reports broken links. That is the scaffold saying it is unfinished.
+created but not yet written reports broken links, and its `TODO`-only sections as the advisory
+*Unfilled Template Sections*. That is the scaffold saying it is unfinished.
 
 ### How much of the stack the suite reaches