Validate dangling component-story references

[odinlake]

What

Adds a new ontology validation that flags collection Component Stories entries referencing stories that don't exist in the ontology — the same class of issue as the existing "Undefined theme" check, but for collection membership.

Why

The themeontology data has real cases of this: e.g. Marvel Cinematic Universe / Spider-Man list movie: SpiderMan: No Way Home (2021), and TRIPOD films lists movie: Unforgiven (1992) (which exists only without the movie: prefix) — none of which resolve to a story. Nothing currently surfaces these.

How

• New TOImpl.validate_components() (in to_base.py), mirroring validate_storythemes(): for each story, any Component Stories name not in self.o.story yields a warning.
• Wired into ThemeOntology.validate() (so it flows through print_warnings() and the to-validate CLI).
• New fixture tests/data/dangling-component.st.txt + TestValidation::test_component_warning.
• Version bumped to 2.1.4.

Tests

pytest --cov=totolo → 112 passed, 100% coverage.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (5e86761) to head (c82fd87).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #40   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           25        25           
  Lines         1601      1607    +6     
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+ Hits          1601      1607    +6     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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