Canvas cold-start backfill + empty-over-full guard#831
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First tabbed tick on a loop with an empty quotes ledger gathers the full transcript history and extracts per conversation (sequential calls), so existing canvases inherit their room's material instead of going blank; later ticks return to delta gathering. An extraction that leaves no quotes, concepts, or host items can no longer overwrite a contentful wall — the tick no_ops with the reason recorded. Found live on echo-next: a manual tick replaced the 13th-week retro wall with the empty skeleton (generation 3f987bfc). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Fixes the live regression found while verifying #830 on echo-next: a manual tick on the existing 13th-week retro canvas replaced the wall with an empty tabbed skeleton, because ledgers start empty and extraction only reads transcript newer than the last tick.
backfill: N conversationsrecorded on the run; subsequent ticks return to deltano_opwith reason, previous wall stays newest; genuinely new canvases still render the skeletonGates: server ruff + 40 canvas tests. Report:
wave28c-REPORT.md🤖 Generated with Claude Code