GitHub documents applyTo as a single comma-separated string (e.g.
"**/*.ts,**/*.tsx") and treats both ** and **/* as all-files. The rule
loader kept the whole CSV value as one glob and missed **/* for
always-apply. Split applyTo via parseCSV and include **/* as all-files.
Addresses review feedback on #2734.
Added GitHub Copilot instruction-file discovery to the github rule provider path, mapping applyTo frontmatter into always-apply or glob-scoped rules and avoiding duplicate always-apply prompt content when context imports the same file.\n\nFixes #2731
Address review against GitHub Copilot CLI docs (add-custom-instructions):
- COPILOT_CUSTOM_INSTRUCTIONS_DIRS: each dir contributes AGENTS.md (context) and .github/instructions/**/*.instructions.md (recursive), per spec. Dropped the non-spec <dir>/copilot-instructions.md and the wrong top-level <dir>/*.instructions.md scan.
- Scan the project .github/instructions/ tree recursively ('within or below').
- Prompts: .github/prompts/*.prompt.md is a VS Code construct, not a Copilot CLI feature; dropped the fictional ~/.copilot/prompts/ user dir and reframed comments/descriptions accordingly.
The github provider only scanned the project .github/ tree, so Copilot CLI's user-global config was ignored. Add user-global instructions (~/.copilot/copilot-instructions.md), COPILOT_HOME relocation, COPILOT_CUSTOM_INSTRUCTIONS_DIRS (copilot-instructions.md + *.instructions.md), and prompt discovery (*.prompt.md in .github/prompts/ and ~/.copilot/prompts/).
Closes#1913, #1915, #1916.
can1357