docs: add conventional commit instructions for Copilot agents

[Copilot]

Adds conventional commit format requirements for PR titles to ensure consistency across AI agent contributions.

Changes

• .github/copilot-instructions.md: New instruction file for GitHub Copilot agents specifying:

  • Required format: <type>(<scope>): <description>
  • Valid types: feat, fix, docs, refactor, test, chore, ci, build, perf, style
  • Repository-specific scopes: metrics, renderer, collector, post, main, lib, tests, docs, workflow, deps
  • Description rules: imperative present tense, no capitalization, no period
  • Examples of correct and incorrect PR titles
  • Breaking changes notation with ! syntax

• CLAUDE.md: Added PR title format section with conventional commit requirements and cross-reference to full guidelines

Format

<type>(<scope>): <description>

Examples:
feat(metrics): add memory pressure tracking
fix(collector): prevent memory leak in long-running processes
chore(deps): update systeminformation to v5.22.0

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.