docs: adding oxygen to contributing docs

[joker23]

• adds oxygen sdk to repo organization section of contributing docs
• adds agents rules to prefer opening draft prs

---

Note

Adds documentation updates to improve repo guidance and accuracy.

• Updates CONTRIBUTING.md repo diagram to include shopify-oxygen and its dependency on sdk-server
• Adds PR workflow rule in .cursor/rules/development.mdc to open PRs as Draft by default
• Minor cleanup in .cursor/rules/testing.mdc (removes stray lines)

^{Written by Cursor Bugbot for commit 3b0df7b. This will update automatically on new commits. Configure here.}

[github-actions]

@launchdarkly/js-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 25394 bytes
Compressed size limit: 26000
Uncompressed size: 124693 bytes

[github-actions]

@launchdarkly/browser size report
This is the brotli compressed size of the ESM build.
Compressed size: 171249 bytes
Compressed size limit: 200000
Uncompressed size: 797978 bytes

[github-actions]

@launchdarkly/js-client-sdk size report
This is the brotli compressed size of the ESM build.
Compressed size: 23264 bytes
Compressed size limit: 25000
Uncompressed size: 80869 bytes

[github-actions]

@launchdarkly/js-client-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 18984 bytes
Compressed size limit: 20000
Uncompressed size: 98086 bytes