Add SchemaFactoryAlpha object option defaults

[noencke]

Summary

• add SchemaFactoryAlphaOptions.objectOptionDefaults as an optional constructor setting
• apply object defaults across alpha object APIs and preserve them in scoped factories
• add compatibility, metadata, override, recursive, and scoped-factory coverage
• update generated tree and fluid-framework API reports

Validation

• pnpm --filter @fluidframework/tree run check:format
• pnpm --filter @fluidframework/tree run build:compile
• pnpm --filter @fluidframework/tree run lint
• pnpm --filter @fluidframework/tree run test:mocha:esm -- --grep SchemaFactory

Work item: https://dev.azure.com/fluidframework/internal/_workitems/edit/42713

[github-actions]

Hi! Thank you for opening this PR. Want me to review it?

Based on the diff (332 lines, 10 files), I've queued these reviewers:

• Correctness — logic errors, race conditions, lifecycle issues
• Security — vulnerabilities, secret exposure, injection
• API Compatibility — breaking changes, release tags, type design
• Performance — algorithmic regressions, memory leaks
• Testing — coverage gaps, hollow tests

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[github-actions]

🔗 No broken links found! ✅

Your attention to detail is admirable.

linkcheck output

1: starting server using command "npm run serve -- --no-open"
and when url "[ 'http://127.0.0.1:3000' ]" is responding with HTTP status code 200
running tests using command "npm run check-links"


> fluid-framework-website@0.0.0 serve
> docusaurus serve --no-open

[SUCCESS] Serving "build" directory at: http://localhost:3000/

> fluid-framework-website@0.0.0 check-links
> linkcheck http://localhost:3000 --skip-file skipped-urls.txt

Crawling...

Stats:
  294289 links
    1937 destination URLs
    2187 URLs ignored
       0 warnings
       0 errors