Chandler Copeland c81e8ea838 feat(05-01): add preparePdf utility and fields/prepare API routes ...

- Installed @cantoo/pdf-lib for server-side PDF mutation
- Created src/lib/pdf/prepare-document.ts with preparePdf function using atomic tmp->rename write pattern
- form.flatten() called before drawing signature rectangles
- Created GET/PUT /api/documents/[id]/fields routes for signature field storage
- Created POST /api/documents/[id]/prepare route that calls preparePdf and transitions status to Sent
- Fixed pre-existing null check error in scripts/debug-inspect2.ts (Rule 3: blocking build)
- Build compiles successfully with 2 new API routes

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-03-19 23:54:41 -06:00

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