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Lower the diff-coverage gate from 90% to 80% and the critical-module target from 90% to 85%. The 90% diff gate forced back-fill tests on nearly every changed line; 80% keeps new code honest without the churn. Global coverage stays informational per ADR 0004 (no new gate added). Updates scripts/diff_coverage.py, scripts/coverage.sh, scripts/critical-modules.txt, .gitea/workflows/test.yml, and records the change as a dated revision in ADR 0004. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>