docs: rebuild onboarding around the CopilotKit channels CLI

.env.example

@@ -1,10 +1,16 @@
-# -- Intelligence Variables --
-export INTELLIGENCE_API_KEY=cpk-...       # Create a runtime key at https://intelligence.copilotkit.ai.
-export INTELLIGENCE_CHANNEL_NAME=open-tag # Must match the Channel name; defaults to "open-tag".
+# -- Runtime Variables --
+export INTELLIGENCE_API_KEY=cpk-...       # Runtime key from `copilotkit project select`, or https://intelligence.copilotkit.ai.
+export INTELLIGENCE_CHANNEL_NAME=open-tag # Must match .copilotkit/channels.json exactly. Forks: use your own name.
+export AGENT_URL=http://localhost:8123/   # AG-UI endpoint the runtime calls; the bundled Python agent serves this locally.
+
+# Slack and Teams credentials are NOT set here. Intelligence owns the adapters;
+# `copilotkit channels add` tells you where its credentials go.
 
 # -- Agent Variables --
 export OPENAI_API_KEY=sk-...              # Create a key at https://platform.openai.com/api-keys.
-export AGENT_URL=http://localhost:8123/   # AG-UI endpoint; the bundled Deep Agent uses this locally.
+
+# -- Runtime Overrides (Optional) --
+# export LOG_LEVEL=debug                  # Defaults to "error"; Channel lifecycle breadcrumbs log at "warn".
 
 # -- Agent Overrides (Optional) --
 # export TAVILY_API_KEY=tvly-...

.gitignore

@@ -2,6 +2,16 @@ node_modules
 .env
 .env.local
 
+# CopilotKit CLI channel artifacts.
+# .copilotkit/channels.json is the tracked Channel declaration; artifacts are not.
+.copilotkit/artifacts
+
+# CopilotKit CLI skill installs (`copilotkit channels setup`, `copilotkit skills install`)
+.agents
+.claude/skills
+agent/skills
+skills-lock.json
+
 # E2E harness artifacts
 e2e/.chrome-profile
 e2e/results