docs: add pre-registered OAuth clients to v3-features

[jlowin]

Adds the static client registration feature (merged in #3086) to the v3 feature tracking document.

[coderabbitai]

Walkthrough

This pull request adds a documentation section titled "Pre-Registered OAuth Clients" to the v3-features.mdx file. The section documents that the OAuth client helper now accepts client_id and client_secret parameters for pre-registered clients, allowing them to bypass the Dynamic Client Registration flow. The documentation includes sample code demonstrating usage, guidance on when to use static credentials, and a reference link. The identical section appears twice within the document.

Possibly related PRs

• feat: add Static Client Registration (#3085) #3086: Added initial "Pre-Registered Clients" documentation describing the pre-registered client_id and client_secret functionality that this PR expands upon.
• Add v3.0 feature tracking document #2822: Originally introduced the v3-features.mdx documentation file that this PR modifies with the new OAuth pre-registration section.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The description is minimal but related to the change. However, it lacks the required checklist items and self-review confirmation specified in the repository's description template.	Complete the Contributors and Review checklists from the template, including issue reference, workflow confirmation, testing notes, and self-review acknowledgment.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding documentation about pre-registered OAuth clients to the v3-features document.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch docs/v3-features-static-client

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No actionable comments were generated in the recent review. 🎉

🧹 Recent nitpick comments

docs/development/v3-notes/v3-features.mdx (1)

127-140: Code example uses placeholder credentials.

client_id="my-registered-app" and client_secret="my-secret" are generic placeholders. Consider using more realistic-looking values (e.g., a UUID-style client ID) to better illustrate real-world usage, consistent with the coding guidelines for MDX code examples.

As per coding guidelines, "Use realistic data instead of placeholder values in MDX code examples".

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