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Code review fixes for the #432 loop-pin-labels feature: - Fix loop rendering to use port indices instead of pin numbers (pre-existing bug: non-sequential pins produced wrong diagram) - Add duplicate label check to the ambiguity branch in resolve_pin() - Prevent self-referencing loops (pin looped to itself) - Fix activate_pin() type annotation to accept Optional[Side] - Deduplicate pin resolution: Harness.connect() now delegates to Connector.resolve_pin() instead of reimplementing the logic - Add 21-test suite covering all resolution paths and error modes