chore: migrate ignore files and update CI trigger

[VdustR]

Summary

• Rename .prettierignore to .eslintignore for ESLint ignore patterns
• Add ignore patterns to .oxfmtrc.json for oxfmt formatter
• Update VSCode workspace to recommend oxc.oxc-vscode extension instead of prettier.prettier-vscode
• Update README example to use .eslintignore
• CI: Only run check workflow on push to main branch (PR checks still run on all PRs)

Test plan

• pnpm run lint:es:dry - ESLint passes
• pnpm run lint:oxfmt:dry - oxfmt formatting passes
• pnpm run checkTypes - Type checking passes

🤖 Generated with Claude Code

[gemini-code-assist]

Summary of Changes

Hello @VdustR, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request streamlines the project's code quality tooling by migrating from Prettier to oxfmt and consolidating ignore patterns under ESLint. The changes involve renaming the primary ignore file, configuring the new formatter with appropriate exclusions, and updating development environment recommendations to reflect this transition. The overall impact is a more consistent and modern approach to linting and formatting across the codebase.

Highlights

• Configuration File Renaming: The .prettierignore file has been renamed to .eslintignore to centralize ignore patterns for ESLint.
• New Formatter Integration: Ignore patterns have been added to .oxfmtrc.json to configure the oxfmt formatter, indicating a shift in the project's formatting tool.
• VSCode Extension Recommendation Update: The VSCode workspace configuration has been updated to recommend oxc.oxc-vscode instead of prettier.prettier-vscode, aligning with the new formatting tool.
• Codebase References Updated: References to the ignore file in README.md and eslint.config.ts have been updated to point to the new .eslintignore.
• Spell Checker Configuration: The cspell.json file has been updated to include .eslintignore in its ignore list and remove the old .prettierignore.

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[gemini-code-assist]

Code Review

This pull request effectively migrates the project from using .prettierignore to .eslintignore for ESLint and adds ignore patterns to .oxfmtrc.json for the oxfmt formatter. The changes are consistent across the codebase, including updates to the VSCode workspace settings, README documentation, and other configuration files. I have one suggestion regarding the duplication of ignore patterns to improve long-term maintainability.