docs(audit): remove completed CODE-AUDIT.md
The audit is fully closed (0 open / 372 done); all findings shipped to main across Batches 6-28. Removing the 2,558-line tracking doc now that it holds no open items. The preview-probe harness (.claude/launch.json) is retained. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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