Serialize native PCB arcs

[ShiboSoftwareDev]

Why

Altium stores PCB curves as native Arc primitives in an Arcs6 stream. AltiumTS could parse some arc data, but its PCB writer rejected Arc, so converters could not produce a real curved Altium primitive.

What changed

• serialize PCB Arc records into the native Arcs6 binary stream
• preserve center, radius, start/end angles, width, layer, component, net, polygon, and keepout data
• parse the native arc keepout flag
• validate supported arc fields and continue rejecting genuinely unsupported primitive kinds
• prove the binary round trip with one focused test file

Verification

• bun test — 182 passed, 1,269 assertions
• bun run lint
• bun run typecheck
• bun run format:check
• package ESM, declaration, CLI, and size verification
• browser bundle verification
• site typecheck

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Project	Deployment	Actions	Updated (UTC)
altiumts	Error		Aug 26, 2026 2:14pm