add AGENTS.md and make copilot-instructions.md as symlink of it
Merged
YA
8d ago+28+28+01234567890123456789-24-24-01234567890123456789
Summary by cubic
Consolidates agent instructions into a single AGENTS.md and makes .github/copilot-instructions.md a symlink to it so both tools read the same conventions.
- Adds a new rule to create Git worktrees under
.worktree/unless the user specifies otherwise. - Preserves the existing repository shape, content conventions, and validation notes from the previous copilot instructions.