Tabbed living canvas: additive ledgers + model extraction with mechanical receipts#830
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…h mechanical receipts The canvas becomes fixed-shape tabs (Crux, Concept cloud, Story) over persisted additive ledgers on agent_loop (quotes, concepts, crux history, host items, story slides). Each content-bearing tick runs one structured MULTI_MODAL_FAST extraction carrying the judgment-layer checklists from docs/plans/canvas-ux-handoff.md; code then enforces the receipts mechanically: a quote is accepted only if it appears verbatim in the gathered transcript, a concept only if its phrase lives inside an accepted quote, and slide trace markup only for accepted ids. Caps (3 XL / ~20 tiles) and crux update-not-append are enforced in code. Model failure no_ops the tick with previous state intact. Rendering is a deterministic sanitized fragment: CSS-only tab bar and trace expansion (sanitizer round-trip tested), brand kit v2 per the handoff. addToCanvas/removeFromCanvas agent verbs store exact host text into a target tab and enqueue a manual tick immediately. Idempotent migration adds the ledger JSON fields. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Implements the tab model from the 2026-07-08 owner conversations plus Oren's design handoff (distilled to
docs/plans/canvas-ux-handoff.md).agent_loop: quotes, concepts, crux + history, host items, story slides — ticks append, nothing rebuilds, unchanged tabs render unchangedaddToCanvas/removeFromCanvasagent verbs: host-made items stored exactly, routed to a tab, manual tick fires immediately ("put Cesare's reflection on the wall")Gates: server ruff + 36 canvas tests, agent 97 tests. Reports:
wave28-REPORT.md,wave28b-REPORT.md(28b restored model-driven extraction after the first pass went fully deterministic).🤖 Generated with Claude Code