R2 closes the engine refactor non-breaking phase. The V2 model from
R1 is now reachable from any V1 document via a pure migrator, and
the engine's local SemaIntent copy stays in lockstep with the
canonical $uix/intent.INTENTS via a runtime assertion.
engine/migrate-v2.ts (~370 lines):
- Pure function migrateV1ToV2(input, opts?) → { document, runtimeState,
warnings }.
- Per-block migration paths for paragraph / heading / quote / code /
list / table / image / divider / callout. Each rejects invalid
values defensively (e.g. invalid heading level coerced to 1 with
warning).
- P4 enforcement on image: drops `image.status` from the content,
moves it to `runtimeState.imageStatus: Map<blockId, status>` keyed
by an autogen id. Caller (provider) restores into in-memory
sidecar on load.
- P1 sweep on table: drops `striped` / `compact` (presentation
tokens) with warnings. Drops `cell.tone` (design-system token)
with warning. Renames list.children → list.items silently.
- Marks reshape: V1 template-literal `'color:#hex'` /
`'bgcolor:#hex'` → V2 structured `{type:'color'|'background',
value:'#hex'}`. Already-structured marks pass through unchanged.
- Code blocks narrow to text-only: flattens any link inside code
into its text content with warning.
- Idempotent on V2 input: a V2 document round-trips with zero
warnings and exact-equal output (validates with
validateWordsDocument).
- Default id generator uses crypto.randomUUID() when available, with
Math.random + monotonic counter fallback. Tests inject a
deterministic sequential generator.
engine/sema-parity.ts (~60 lines):
- assertSemaIntentParity(canonicalIntents) throws SemaIntentParityError
if the engine's local WORDS_EVAL_INTENTS drifts from the canonical
list. Error names both the missing and extra values + points to
the file to update.
- Caller passes canonical list (avoids cross-package import in this
module). Provider mount calls it with $uix/intent.INTENTS.
engine/migrate-v2.test.ts (35 tests):
- Entry-point shape handling (null / non-object / non-array children).
- Per-block migration (paragraph, heading with level clamp, quote
with cite, code with text-only narrowing + link flattening, list
with kind coercion and indent-0 omission, table with token drops,
image with src validation).
- P4 enforcement: image.status → runtimeState.imageStatus keyed by
autogen id; respects caller-provided id.
- Marks reshape: template-literal → structured; structured
pass-through; invalid hex rejected; unknown boolean dropped.
- Idempotence on V2 input (paragraph, callout, divider).
- Callout intent: all 6 canonical SemaIntent values accepted;
invalid (e.g. 'warning') coerced to 'neutral' with warning.
- Post-condition: migrator output ALWAYS passes
validateWordsDocument on any V1 input.
- Sema parity: 5 tests including the real golden cross-check
against $uix/intent.INTENTS.
Verification: 170/170 engine tests pass (85 V1 + 50 V2 validator
+ 35 V2 migrator/parity). `npm run check`: 0 errors.
Next: R3 — visual sidecar implementation. Render emits inline
styles from block.visual.*; POLISH-1b (image radius/shadow/border
controls) becomes implementable under this model.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
dev
6c70699ff7