Write embedded schematic PNG images

[ShiboSoftwareDev]

Why

A schematic image record is not sufficient for a native Altium SchDoc. Embedded PNG bytes must also be written into the document /Storage stream. circuit-json-to-altium#107 needs this low-level writer for the PiDP open-source and GitHub artwork.

What changed

• Encode PNG images into the native binary SchDoc /Storage stream.
• Retain the bitmap preview and native PNG payload expected by Altium.
• Match storage entries by normalized filename so an external-image record cannot take an embedded payload.
• Keep the branch current with the latest schematic renderer behavior.

Validation

• bun test tests/binary-schematic-document-creation.test.ts — 3 passed, 11 assertions
• bun run typecheck
• bun run format:check
• bun run build
• git diff --check

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Project	Deployment	Actions	Updated
altiumts	Error		Sep 3, 2026 2:02pm UTC