feat(json): generate syntax_kind.mbt via loomgen --seed (#571)

[dowdiness]

Closes #571

Replace hand-written examples/json/syntax_kind.mbt with generated output from loomgen's --seed path, matching the lambda workflow.

Key differences from hand-written version:

• from_raw uses pub impl @seam.FromRawKind (trait impl, matching lambda)
• from_raw fallback is ErrorNode instead of ErrorToken (matches term kind annotation)
• Adds IsTrivia and IsError trait impls (were missing in hand-written)

Regenerated examples/json/pkg.generated.mbti for new trait impl signatures.
Added CI step to verify json syntax_kind.mbt regeneration stays in sync.

moon test --target native: 3309/3309 pass

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a94e3af1-90d7-4e4b-b58a-63bd9b5276a6

📥 Commits

Reviewing files that changed from the base of the PR and between 1af41fb and a2c04b4.

📒 Files selected for processing (3)

• .github/workflows/ci.yml
• examples/json/pkg.generated.mbti
• examples/json/syntax_kind.mbt

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/571-json-syntax-kind-seed

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