add Plano agent skills framework and rule set (#797)

* feat: add initial documentation for Plano Agent Skills

* feat: readme with examples

* feat: add detailed skills documentation and examples for Plano

---------

Co-authored-by: Adil Hafeez <adil.hafeez@gmail.com>

skills/rules/cli-init.md

@@ -0,0 +1,66 @@
+---
+title: Use `planoai init` Templates to Bootstrap New Projects Correctly
+impact: MEDIUM
+impactDescription: Starting from a blank config.yaml leads to missing required fields and common structural mistakes — templates provide validated, idiomatic starting points
+tags: cli, init, templates, getting-started, project-setup
+---
+
+## Use `planoai init` Templates to Bootstrap New Projects Correctly
+
+`planoai init` generates a valid `config.yaml` from built-in templates. Each template demonstrates a specific Plano capability with correct structure, realistic examples, and comments. Use this instead of writing config from scratch — it ensures you start with a valid, working configuration.
+
+**Available templates:**
+
+| Template ID | What It Demonstrates | Best For |
+|---|---|---|
+| `sub_agent_orchestration` | Multi-agent routing with specialized sub-agents | Building agentic applications |
+| `coding_agent_routing` | Routing preferences + model aliases for coding workflows | Claude Code and coding assistants |
+| `preference_aware_routing` | Automatic LLM routing based on task type | Multi-model cost optimization |
+| `filter_chain_guardrails` | Input guards, query rewrite, context builder | RAG + safety pipelines |
+| `conversational_state_v1_responses` | Stateful conversations with memory | Chatbots, multi-turn assistants |
+
+**Usage:**
+
+```bash
+# Initialize with a template
+planoai init --template sub_agent_orchestration
+
+# Initialize coding agent routing setup
+planoai init --template coding_agent_routing
+
+# Initialize a RAG with guardrails project
+planoai init --template filter_chain_guardrails
+```
+
+**Typical project setup workflow:**
+
+```bash
+# 1. Create project directory
+mkdir my-plano-agent && cd my-plano-agent
+
+# 2. Bootstrap with the closest matching template
+planoai init --template preference_aware_routing
+
+# 3. Edit config.yaml to add your specific models, agents, and API keys
+#    (keys are already using $VAR substitution — just set your env vars)
+
+# 4. Create .env file for local development
+cat > .env << EOF
+OPENAI_API_KEY=sk-proj-...
+ANTHROPIC_API_KEY=sk-ant-...
+EOF
+
+echo ".env" >> .gitignore
+
+# 5. Start Plano
+planoai up
+
+# 6. Test your configuration
+curl http://localhost:12000/v1/chat/completions \
+  -H "Content-Type: application/json" \
+  -d '{"model": "gpt-4o", "messages": [{"role": "user", "content": "Hello"}]}'
+```
+
+Start with `preference_aware_routing` for most LLM gateway use cases and `sub_agent_orchestration` for multi-agent applications. Both can be combined after you understand each independently.
+
+Reference: https://github.com/katanemo/archgw