Add commit message guide for music production context

[Copilot]

Repository commit history contains multiple vague "Initial plan" messages that provide no context about changes. Commit f242d0b exemplifies this - an empty commit with no descriptive information.

Changes

• docs/COMMIT_GUIDE.md: Commit message guide with music industry-specific examples (split sheets, metadata standards, PRO codes, royalty tracking)
• README.md: Link to guide in Contributing section

Examples from guide

✅ Clear
Add 3-writer split sheet variant
Fix royalty percentage rounding error
Document ISRC code requirements for distribution

❌ Vague
Update template
Bug fix
Initial plan

Guide emphasizes answering "what specific thing changed" with domain-relevant context rather than generic placeholders.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/Sin-Estres-dev/Strezless/commits/f242d0b68e0528071159159f65aa0877fc8a0aae
  • Triggering command: /usr/bin/curl curl -s -H Accept: application/vnd.github.v3+json REDACTED (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Reference: f242d0b

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💡 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.