Trace ComfyUI workflow history in Pathlight

[syndicalt]

Goal

Export ComfyUI workflow executions into Pathlight so each run is inspectable as a trace and each prompt node is inspectable as a span.

Sprint 1 scope

• Add a standalone bridge for saved or live ComfyUI history responses.
• Map one workflow history item to one Pathlight trace.
• Map prompt nodes to chain spans with class type, node inputs, output metadata, and failures.
• Validate against the local collector with success and failure histories.

Follow-up scope

• Live server extension/custom node pack for node timing and artifacts.
• Generated media artifact links/previews.
• Eventloom journaling for agent-driven ComfyUI decisions.

[syndicalt]

Sprint 2 update: added a ComfyUI custom node/server extension under packages/comfyui/plugin/pathlight. It registers /pathlight/comfyui routes, can manually export a prompt history, and auto-exports completed ComfyUI workflows when PATHLIGHT_COMFYUI_AUTO_EXPORT is enabled. Installed locally via symlink into ComfyUI custom_nodes/pathlight. Verification: npm --workspace @pathlight/comfyui test, npm test, and npm run build all pass.

[syndicalt]

Docs/site update: added docs/comfyui.md with plugin install, config, verification, auto-export, manual export, and current limits; updated docs index and roadmap to mark the initial ComfyUI bridge/plugin as shipped; added a ComfyUI tracing section, pillar, and docs link to the static site. Also removed the stale support init.py now that the single-file loader is the supported plugin path.