feat: Add Github Copilot integration and installation instructions

integrations/github-copilot/README.md

@@ -0,0 +1,31 @@
+# Github Copilot Integration
+
+The Agency was built for Github Copilot. No conversion needed — agents work
+natively with the existing `.md` + YAML frontmatter format.
+
+## Install
+
+```bash
+# Copy all agents to your Github Copilot agents directory
+./scripts/install.sh --tool copilot
+
+# Or manually copy a category
+cp engineering/*.md ~/.github/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 roster of 61 specialists.