SD-321

[signal-killed] Operator verbatim: “Signal has no signal. Kill it.” Signal notation abandoned as a governance compression mechanism. Adversarial test [SD-320] showed shorthand achieves equal or better compression with equal decode accuracy (16/16 vs 15/16). The := -> | & ! operators add no measurable value over bullets and dashes. Data: data/signal-test/, design: docs/weaver/signal-vs-shorthand-adversarial-test.md, script: bin/signal-test.

**PERMANENT**

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