chore: import upstream snapshot with attribution

integrations/claude-code/README.md

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+# Claude Code Integration
+
+The Agency was built for Claude Code. No conversion needed — agents work
+natively with the existing `.md` + YAML frontmatter format.
+
+## Install
+
+```bash
+# Copy all agents to your Claude Code agents directory
+./scripts/install.sh --tool claude-code
+
+# Or manually copy a category
+cp engineering/*.md ~/.claude/agents/
+```
+
+## Activate an Agent
+
+In any Claude Code 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 Agency roster.