Summary

• Handle (rotate N) lists in pin definitions that shifted coordinate parsing indices
• Support non-numeric pin names (GND, D+, D-, VBUS, A, C, +, -)
• Fix duplicate element IDs for multi-pad pins (SOT89 2@1 pattern)
• Apply component placement rotation to pin offsets for correct positioning
• Add unique via IDs using index-based deduplication
• Tokenize quoted strings in DSN files (e.g. "D-")

Test plan

• All 43 existing tests pass (0 fail)
• New smoothie-board-conversion.test.ts validates full Smoothie Board DSN → CircuitJSON conversion
• New tokenizer-symbol-pins.test.ts validates symbolic pin name parsing
• Verified 0 NaN fields in output, 0 duplicate primary IDs
• Verified USB-B-PTH pins correctly parse GND, D+, D-, VBUS with rotation
• Verified EIA3216 pins correctly parse A/C with rotation
• Format check passes (biome format)

/attempt #54 /claim #54

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