chore(repo): initialize planarchy workspace

.agents/README.md

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+# .agents Directory
+
+This directory contains agent configuration and skills for OpenAI Codex CLI.
+
+## Structure
+
+```
+.agents/
+  config.toml     # Main configuration file
+  skills/         # Skill definitions
+    skill-name/
+      SKILL.md    # Skill instructions
+      scripts/    # Optional scripts
+      docs/       # Optional documentation
+  README.md       # This file
+```
+
+## Configuration
+
+The `config.toml` file controls:
+- Model selection
+- Approval policies
+- Sandbox modes
+- MCP server connections
+- Skills configuration
+
+## Skills
+
+Skills are invoked using `$skill-name` syntax. Each skill has:
+- YAML frontmatter with metadata
+- Trigger and skip conditions
+- Commands and examples
+
+## Documentation
+
+- Main instructions: `AGENTS.md` (project root)
+- Local overrides: `.codex/AGENTS.override.md` (gitignored)
+- Claude Flow: https://github.com/ruvnet/claude-flow