release: v1.8.0 — WCAG accessibility, 50-agent test-fix, clean unused assets

fix: comprehensive WCAG accessibility improvements across 41 files

fix: workflow run results now persist, align delay validation with execution

fix: sanitize WebSocket message logging to prevent token leakage

fix: improve --text-muted contrast ratio to meet WCAG AA

fix: MemoryTab search uses correct /api/search endpoint

fix: watcher ignores node_modules/dist/.git and cleans up file offsets

fix: add rate limiting to /api/search endpoint

fix: secure audit log permissions and reduce sensitive data logging

fix: add path traversal defense-in-depth to restoreFromBackup

fix: SetupWizard handles POST success as WS fallback

fix: v1.7.6 — 50-agent test-fix loop: security, performance, memory leaks, API decomposition

fix: suppress gateway log spam, fix SPA sendFile errors, cleanup shutdown

feat: v1.7.5 — structured logging, error handling hardening, CSS cleanup

fix: v1.7.4 — security hardening (P0/P1 audit fixes)