v0.16.0 — unified core and modules

One general HWP/HWPX engine, capability as verifiable distribution modules. Bundle sha256 + full evidence trail: docs/release-v0.16.0.md. Suite 1293 passed (all-modules) / 866 (core-only); privacy HARD=0; real-form validation: 12 official templates, 10/10 hwp→hwpx conversion, 5 families visually verified.

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