v1.19.0

Features

• Channel support — @channel tag turns photons into Claude Code channels via capabilities negotiation
• Client-agnostic channel support via clientInfo name detection
• Channel permission relay and callable channel object (this.channel())
• MCP Streamable HTTP — always-on for SSE mode, compatible with llama.cpp and modern MCP clients
• Elicitation custom message + render('guide') stepper widget

Bug Fixes

• MCP Streamable HTTP: add event: message + id: to SSE stream per spec
• CORS: allow Mcp-Protocol-Version header, add CORS headers to all responses (202, DELETE, 405)
• Clean SSE startup output — ⚡ web → http://localhost:3000/mcp with loader noise suppressed
• Channel routing through daemon pub/sub with proper namespace isolation
• Bind instance context when capturing emit for channel injection
• Pass baseDir to MemoryProvider for correct directory resolution
• Auto-detect photon directory from cwd when PHOTON_DIR is not set

Refactor

• Migrate photon data and cache paths to ~/.photon/.data/ directory
• Pre-release check: use PHOTON_DIR env var instead of moving ~/.photon