Day 1 (monorepo + Node layout engine):
- Turborepo + pnpm workspaces with apps/web, apps/render-worker, and
packages for types, layout-engine, prompts, api-lib.
- @banner-studio/types: BannerSpec contract, every layer kind, ResolvedLayer,
zod schemas mirroring each interface.
- @banner-studio/layout-engine: Dropflow WASM wrapper, text measurement,
shrink-to-fit, push_siblings, resolveLayout. Snapshot-tested.
Day 2 (browser parity + AI pipeline):
- Layout engine ./browser subpath: same resolveLayout in the browser via
Dropflow WASM build. Quarantined wasm-locator import (dropflow 0.5.1
exports gap).
- Cross-group push_siblings bug fix: deltas now thread through group
recursion via a shared accumulator; regression test added.
- DEMO_TEMPLATE_300x250 promoted to packages/layout-engine/src/templates/.
- @banner-studio/prompts: versioned extract + generate prompts with
zod-defined tool schemas (claude-sonnet-4-6, forced tool-use).
- @banner-studio/api-lib: CSV feed loader, extract/generate/route-node/
assemble agents, orchestrator returning fully-resolved BannerSpec.
Generate agent retries on character-limit overflow.
- apps/web (Next.js 14 App Router): /api/generate route, /parity diff page,
promise-singleton browser engine init.
- feeds/demo.csv with five hand-authored rows of varied length.
- SLICE_DEVIATIONS.md documents the five intentional gaps from
ARCHITECTURE.md with V1 reversal paths.
Verified end-to-end: POST /api/generate against the live Claude API
returns three resolved BannerSpecs and two honestly-skipped rows
(overflow after two attempts). 26 unit + integration tests passing.
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