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-startup.md

@@ -0,0 +1,80 @@
+---
+title: Follow the `planoai up` Validation Workflow Before Debugging Runtime Issues
+impact: HIGH
+impactDescription: `planoai up` validates config, checks API keys, and health-checks all listeners — skipping this diagnostic information leads to unnecessary debugging of container or network issues
+tags: cli, startup, validation, debugging, workflow
+---
+
+## Follow the `planoai up` Validation Workflow Before Debugging Runtime Issues
+
+`planoai up` is the entry point for running Plano. It performs sequential checks before the container starts: schema validation, API key presence check, container startup, and health checks on all configured listener ports. Understanding what each failure stage means prevents chasing the wrong root cause.
+
+**Validation stages and failure signals:**
+
+```
+Stage 1: Schema validation        → "config.yaml: invalid against schema"
+Stage 2: API key check            → "Missing required environment variables: OPENAI_API_KEY"
+Stage 3: Container start          → "Docker daemon not running" or image pull errors
+Stage 4: Health check (/healthz)  → "Listener not healthy after 120s" (timeout)
+```
+
+**Development startup workflow:**
+
+```bash
+# Standard startup — config.yaml in current directory
+planoai up
+
+# Explicit config file path
+planoai up my-config.yaml
+
+# Start in foreground to see all logs immediately (great for debugging)
+planoai up config.yaml --foreground
+
+# Start with built-in OTEL trace collector
+planoai up config.yaml --with-tracing
+
+# Enable verbose logging for debugging routing decisions
+LOG_LEVEL=debug planoai up config.yaml --foreground
+```
+
+**Checking what's running:**
+
+```bash
+# Stream recent logs (last N lines, then exit)
+planoai logs
+
+# Follow logs in real-time
+planoai logs --follow
+
+# Include Envoy/gateway debug messages
+planoai logs --debug --follow
+```
+
+**Stopping and restarting after config changes:**
+
+```bash
+# Stop the current container
+planoai down
+
+# Restart with updated config
+planoai up config.yaml
+```
+
+**Common failure patterns:**
+
+```bash
+# API key missing — check your .env file or shell environment
+export OPENAI_API_KEY=sk-proj-...
+planoai up config.yaml
+
+# Health check timeout — listener port may conflict
+# Check if another process uses port 12000
+lsof -i :12000
+
+# Container fails to start — verify Docker daemon is running
+docker ps
+```
+
+`planoai down` fully stops and removes the Plano container. Always run `planoai down` before `planoai up` when changing config to avoid stale container state.
+
+Reference: https://github.com/katanemo/archgw