chore: import upstream snapshot with attribution

integrations/github-copilot/README.md

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+# GitHub Copilot Integration
+
+The Agency works with GitHub Copilot out of the box. No conversion needed —
+agents use the existing `.md` + YAML frontmatter format.
+
+## Install
+
+```bash
+# Copy all agents to your GitHub Copilot agents directories
+./scripts/install.sh --tool copilot
+
+# Or manually copy a category
+cp engineering/*.md ~/.github/agents/
+cp engineering/*.md ~/.copilot/agents/
+```
+
+## Activate an Agent
+
+In any GitHub Copilot session, reference an agent by name:
+
+```
+Activate Frontend Developer and help me build a React component.
+```
+
+```
+Use the Reality Checker agent to verify this feature is production-ready.
+```
+
+## Agent Directory
+
+Agents are organized into divisions. See the [main README](../../README.md) for
+the full current roster.