Add optional Story Format field on stories with validation

[odinlake]

Summary

Adds an optional Story Format field to stories — a high-level, objective classification of the narrative medium (not genre).

• New Story_Format = sa("text") field on TOStory (maps to the :: Story Format field in .st.txt).
• The field is optional: stories may omit it.
• When set, validate() flags any value outside the permitted vocabulary.

Permitted values

film, tv, stage, prose, game

• film — cinema releases (movie: ids)
• tv — episodic broadcast (no-prefix episode ids)
• stage — live staged works: plays, opera, musicals, ballet (play: ids and the like)
• prose — writings to read: novels, novellas, short stories, fables (novel:/shortstory:/writing: ids)
• game — interactive (videogame: ids)

Validation

TOImpl.validate_storyformat() yields a warning like:
<story>: Unrecognized 'story format' '<value>' (expected one of: ...)
wired into the public ThemeOntology.validate() generator.

Tests

• New fixture tests/data/storyformat.st.txt (valid / invalid / omitted cases).
• TestValidation::test_storyformat_warning.
• Full suite: 112 passed, 100% coverage, pylint 10.00/10.

Version bumped 2.1.3 → 2.2.0 (new public field).

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (20058fe) to head (2bc2902).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

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  Coverage   100.00%   100.00%           
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  Files           25        25           
  Lines         1607      1616    +9     
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+ Hits          1607      1616    +9     

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

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