Refactor preloaded contexts into static JSON assets

[dahlia]

Summary

This PR refactors the preloaded JSON-LD contexts in @fedify/vocab-runtime so that each context is stored as its own static JSON asset instead of being embedded together in one large TypeScript object.

Details

Each preloaded context now lives under packages/vocab-runtime/src/contexts/, and packages/vocab-runtime/src/contexts.ts rebuilds the existing preloadedContexts registry through static JSON imports while preserving the same URL keys, exported API shape, and runtime behavior.

Rationale

This keeps data-only context updates isolated from runtime code, reduces merge conflicts when multiple contexts change independently, and makes context changes easier to review because unrelated definitions no longer live in the same source block.

Testing

I verified the change with deno task -f @fedify/vocab-runtime test, pnpm --filter @fedify/vocab-runtime test, deno test --check --allow-all packages/fedify/src/utils/kv-cache.test.ts, node --test utils/kv-cache.test.js from packages/fedify/dist, and bun test utils/kv-cache.test.js --timeout 60000 from packages/fedify/dist.

Notes

This is an internal refactor with no user-visible behavior change, so CHANGES.md was intentionally not updated.

Related issue

Fixes #627

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a significant internal refactoring to the @fedify/vocab-runtime package by externalizing JSON-LD contexts into individual static JSON files. This change aims to enhance the organization and maintainability of context definitions, making future updates and code reviews more efficient and less prone to conflicts, all without altering any user-facing behavior.

Highlights

• Refactoring of JSON-LD Contexts: Preloaded JSON-LD contexts have been refactored from a single large TypeScript object into individual static JSON assets, improving modularity and maintainability.
• File Organization: Each preloaded context is now stored in its own dedicated JSON file under the packages/vocab-runtime/src/contexts/ directory.
• API and Runtime Preservation: The existing preloadedContexts registry is rebuilt through static JSON imports, ensuring that the same URL keys, exported API shape, and runtime behavior are preserved.
• Improved Maintainability and Reviewability: This refactor isolates data-only context updates, reduces the likelihood of merge conflicts when multiple contexts are modified, and makes context changes easier to review by separating unrelated definitions.

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[gemini-code-assist]

Code Review

This pull request effectively refactors the preloaded JSON-LD contexts into separate static JSON assets, which is a great improvement for code organization and maintainability. The changes are well-structured. I've found one potential issue in the gotosocial.json context file, which appears to be a typo that affects correctness.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

Files with missing lines	Coverage Δ
packages/vocab-runtime/src/contexts.ts	100.00% <ø> (ø)

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[2chanhaeng]

Great!