fix: add @testing-library/dom peer dep; security gate PASS=10 on macOS

- frontend/package.json: add @testing-library/dom ^10.0.0 (missing peer
  dep of @testing-library/react that caused test failure on macOS)
- docs: update security gate result to PASS=10 FAIL=0 SKIP=0 (macOS
  with local ornith:9b) vs PASS=7 SKIP=1 on Windows (no Ollama)
- audit logs: real evidence from running all 10 gates (adversarial suite,
  model router, red-team 30-sample, judge gate, frontend Vitest)
- remove 10 timestamp-named trace stubs (not referenced by
  pipeline-context.yaml; UUID stubs in place and validated)

Verified: security-gate.sh PASS=10 FAIL=0 SKIP=0
          adversarial-harness-tests.sh PASS=40 FAIL=0
          npm test -w frontend: 16 PASS / 0 FAIL

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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