chore(catalog): rename getById to getCollectionSchema

[mborne]

This pull request refactors the CollectionCatalog interface and related classes to rename the method getById to getCollectionSchema. This change improves clarity by making the method's purpose more explicit. The update is applied consistently across the implementation, interface, tests, and documentation.

API Naming Improvements:

• Renamed the getById method to getCollectionSchema in the CollectionCatalog interface (src/catalog/types.ts) and its implementation in InMemoryCollectionCatalog (src/catalog/in-memory.ts). [1] [2]
• Updated all usages of getById to getCollectionSchema in tests (test/unit/catalog/in-memory.test.ts, test/unit/index.test.ts) and documentation (README.md).

(closes #68 )

[Copilot]

Pull request overview

This PR refactors the catalog public API to use a clearer method name (getCollectionSchema) instead of getById, aligning the name with the returned data (collection schema) and the documented HTTP endpoint shape.

Changes:

• Renamed CollectionCatalog.getById to CollectionCatalog.getCollectionSchema in the public interface and InMemoryCollectionCatalog implementation.
• Updated unit tests to call getCollectionSchema instead of getById.
• Updated README usage example to the new method name.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/unit/index.test.ts	Updates catalog API usage in the public entry-point unit test.
test/unit/catalog/in-memory.test.ts	Updates in-memory catalog unit tests to the renamed method.
src/catalog/types.ts	Renames the method on the exported CollectionCatalog interface.
src/catalog/in-memory.ts	Renames the method on the in-memory implementation to match the interface.
README.md	Updates documentation example to use the new API name.

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