[pat-mw]

Notes pin to the current canvas selection and live in one file, .stacki/feedback.json, inside the open project (git-excluded with the rest of .stacki/). Claude Code reads that file with its own Read tool, edits the project, and flips each item's "done"; Stacki re-reads it on window focus, when the tab opens, and before every write. No server, port or watcher: the file is the interface, because the agent can already read the project.

• shared/ipc/feedback.ts: the item and file parsers (version 1, bounded, ids unique). Agent-appended items may omit createdAt and use keys: [].
• feedback:read / feedback:write: one channel pair through the usual six touch points. Main resolves each item's file:line trail from its selection keys with selectionTrail on every read and write, and writes through writeProjectText so the write is atomic like every project write.
• Every renderer change reads the file fresh, applies itself, then writes, so an agent's done flips made in the meantime are not overwritten.
• Feedback rail tab (M), with Copy for agent rendering the handoff text.
• Numbered pins on the canvas for open notes at the current drill-in level; their paths join the frame's tracked set so it measures them.

shortcut: pins are index paths, not handle-carried spans; a structural edit above a pinned node moves the pin to its neighbour. Upgrade by storing a byte span mapped with shared/engine/mapSpan.ts if notes start living across editing sessions.