chore: run prettier during lint

[chenjiahan]

Summary

• keep lint and formatting checks on the same path by running Prettier from pnpm lint
• add a lint:fix script and normalize existing workflow, config, fixture, and test files so the new check passes consistently
• rename the Renovate config to .json to align it with the repo formatting flow

Related Links

• None

[Copilot]

Pull request overview

This PR aligns linting and formatting by running Prettier as part of pnpm lint, adds a lint:fix helper, and normalizes repository files so the new formatting check passes consistently.

Changes:

• Update pnpm lint to run rslint and prettier --check; add lint:fix to auto-fix both.
• Apply Prettier-driven formatting updates across tests, fixtures, workflow YAML, and editor settings.
• Normalize Renovate config formatting.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/skills.test.ts	Prettier formatting adjustments and lint suppression comments around any casts.
test/fixtures/agents-md/template-common/AGENTS.md	Normalize Markdown spacing to match formatting expectations.
test/custom-tools.test.ts	Add lint suppression comments for explicit any casts in mocks.
test/agents.test.ts	Update expected AGENTS.md output formatting (blank lines).
package.json	Run Prettier during lint; add lint:fix script.
.vscode/settings.json	Prettier formatting normalization.
.github/workflows/test.yml	Quote style normalization in YAML.
.github/workflows/release.yml	Quote style normalization in YAML.
.github/renovate.json	Remove trailing whitespace/newline artifact.

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