Chandler Copeland c1e1e5ec49 feat(13-01): implement aiCoordsToPagePdfSpace and AI field utilities ...

- Install openai 6.32.0 (npm package, listed in dependencies)
- Create src/lib/ai/extract-text.ts — pdfjs-dist legacy build server-side text extraction
  - extractPdfText(filePath) returning PageText[] with page, text, width, height
  - GlobalWorkerOptions.workerSrc = '' for Node.js fake-worker mode
  - Text per page capped at 2000 chars for GPT-4o-mini context limit
- Create src/lib/ai/field-placement.ts — GPT-4o-mini structured output + coord conversion
  - aiCoordsToPagePdfSpace() converts AI top-left pct coords to PDF bottom-left points
  - classifyFieldsWithAI() uses manual json_schema (NOT zodResponseFormat — broken with Zod v4)
  - Standard field sizes: checkbox=24x24pt, others=144x36pt
  - textFillData keyed by field UUID (not label) per Phase 12.1 design
- All 3 unit tests pass (GREEN phase confirmed)

2026-03-21 17:00:34 -06:00

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