v0.4.0

Changelog

• 379b7dc Fix canvas license compatibility
• b5bf66c Vendor Go dependencies
• 9eb49a7 add supported barcodes to README
• 9e6311d clarify + update docs
• 5d4712a create NOTICE and update Bundled Third-Party Components
• c823f8c feat(mcp): add capability discovery via resource, prompts, and enums
• 77e194e feat: github pages
• ede03e2 feat: help command and port config
• 7b4bc46 fix: api doc update
• 3a25872 fix: close active sessions on shutdown
• f83af7b fix: mDNS shutdown
• 34dd3b9 nit: ui layout