augment: phase 2 — Swift canonical parity binding

[Zer0pa-Architect-Prime]

Implemented the Phase 2 Swift binding parity pass.

Changed files:

• code/bindings/swift/ZPEInk.swift
• code/bindings/swift/Tests/ZPEInkParity.swift
• code/tests/test_swift_binding.py

Validation:

• .venv/bin/python -m pytest --tb=short -q code/tests/test_swift_binding.py
• make test PYTHON=.venv/bin/python
• .venv/bin/python -W error -m pytest --tb=short -q

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[Zer0pa-Architect-Prime]

Duplicate of #7. Same commit (85a1e5d) on same branch (augment/phase-2). #7 correctly targets augment/phase-1 as base. Closing this duplicate.