feat(v5.7.4): Semantic Closure Gate, Delete unused files, PDF Fixes

V5.7.1: Unified Product State Authority - Fixed post-pricing amnesia & enabled multi-product support

V5.4: Resolve False Zero Prices & Implement Partial Transparency - Hebrew PDF Support Hardened

Spec v5.3: Operation Beit Yitzhak Hardening (Domain Gate, Visual Trust, Semantic Aging)

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Initial commit - Clean start without node_modules