docs: fix checks best practices examples and add skill links

[sestinj]

Summary

• Remove diff-scoping language ("in the changed code") from two examples on the best practices page that contradicted the page's own advice about not including scoping instructions
• Delete the Conventional Commits example since PR title format validation is a pattern-match task better suited for a linter — contradicts the "Checks vs. tests vs. linting" guidance on the same page
• Add links to the writing-checks and check skills on their respective pages

Test plan

• Verify the best practices page renders correctly
• Confirm no remaining examples contain diff-scoping language
• Confirm skill links resolve correctly

🤖 Generated with Claude Code

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Summary by cubic

Align checks docs with best practices and make skill installation clearer. Removed diff-scoping language from two examples, deleted the Conventional Commits example (title format should be linted), and added links to the writing-checks and check skills.

^{Written for commit d81d593. Summary will update on new commits.}

[continue-staging]

Docs Review: No additional documentation updates needed.

This PR is itself a documentation improvement that:

• Fixes contradictory diff-scoping language in check examples
• Removes the Conventional Commits example (better suited for linters)
• Adds helpful skill links to the generating-checks and running-locally pages

The changes are well-scoped and improve clarity without expanding scope unnecessarily.

[continue-staging]

No additional documentation updates needed.

This PR already contains well-scoped documentation improvements:

• Language consistency: Removed diff-scoping language from examples that contradicted the page's own guidance about automatic diff scoping
• Example cleanup: Removed the Conventional Commits example since PR title validation is a pattern-matching task better suited for linters (correctly follows the 'Checks vs. tests vs. linting' guidance)
• Improved discoverability: Added direct links to the writing-checks and check skills in the GitHub repository

All changes align with the documentation's own best practices and improve clarity without adding unnecessary scope.

[cubic-dev-ai]

No issues found across 3 files