Docs: fill in TODOs and improve cross-links

[Vamsi-klu]

Summary & Motivation

• fill in low-priority TODOs with links or concise text in docs/templates
• add missing API references and cross-links to reduce doc dead-ends
• tidy examples/tests and UI test ids for consistency

How I Tested These Changes

• not run (docs/examples/UI-only changes)

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 3d3806a574

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[cmpadden]

Thanks @Vamsi-klu , however, we should not be removing all of the TODOs without replacing them with valid content.

If you would like to undo those removals but keep the content additions that would be appreciated.

[Vamsi-klu]

@cmpadden Thanks for your comment, i will undo this and raise a PR for your review shortly in 2 days. Thanks!