Implement the 031-quality-gates-hygiene feature that strengthens automated quality gates by adding pnpm audit to the check script, v8 coverage thresholds with per-directory auto-ratchet (domain 96%, adapters 71%, persistence 87%), Biome cognitive complexity enforcement (max 15), and keyboard accessibility for the combatant row, while cleaning up all blanket biome-ignore comments, refactoring 5 overly complex functions into smaller helpers, and codifying the early-enforcement principle in the constitution and CLAUDE.md

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

specs/031-quality-gates-hygiene/data-model.md

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+# Data Model: Quality Gates & Code Hygiene
+
+**Feature**: 031-quality-gates-hygiene
+**Date**: 2026-03-11
+
+## Overview
+
+This feature has no new domain entities. It modifies configuration files, documentation, and refactors existing code for lint compliance. No data model changes.
+
+## Configuration Artifacts
+
+### Vitest Coverage Config (vitest.config.ts)
+
+New `test.coverage` block:
+- `provider`: "v8"
+- `enabled`: true
+- `thresholds.lines`: 70 (initial, auto-ratchets)
+- `thresholds.branches`: 60 (initial, auto-ratchets)
+- `thresholds.autoUpdate`: true
+
+### Biome Config (biome.json)
+
+New rules under `linter.rules`:
+- `complexity.noExcessiveCognitiveComplexity`: error, maxAllowedComplexity: 15
+- `a11y.noNoninteractiveElementInteractions`: error
+
+### Check Script (package.json)
+
+Updated `check` script adds `pnpm audit --audit-level=high` step.
+
+## New Component
+
+### StopPropagation Wrapper (apps/web/src/components/)
+
+A small presentational component that wraps children in a `<div>` with `onClickCapture` to stop propagation, replacing the current pattern of `<div onClick={e => e.stopPropagation()}>` that requires biome-ignore comments. Exact implementation TBD during task execution — alternatives include using `role="presentation"` or restructuring the click handling logic in the parent row.