Add x-api-key header to Context7 MCP config using CONTEXT7_API_KEY env
var with empty default so it remains optional. Without auth, all requests
hit the anonymous rate limit ("Monthly quota exceeded"). Also update
README to document the API key setup and the Known Issues workaround.
Closes#153
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Create commands/ce/ directory with ce:plan, ce:work, ce:review,
ce:brainstorm, and ce:compound as the new primary commands.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
