Phase 58 closeout

[YSCJRH]

Closes #453.

Summary

• sync Phase 58 docs from active/ready to closeout/no-ready after [codex] Sync Phase 58 route-readiness gate #456 and [codex] Add Phase 58 route-readiness smoke evidence #457
• record Phase 58 exit gate #453 as the final closeout gate and preserve the narrow route-readiness boundary
• update Phase 58 gate tests to reject stale ready-queue wording

Validation

• python -m pytest backend/tests/test_phase58_route_readiness_gate.py backend/tests/test_phase58_route_readiness_snapshots.py -q
• python scripts/check_no_secrets.py
• git diff --check
• python -m backend.app.cli audit-github-queue --repo YSCJRH/mirror-sim
• python -m backend.app.cli classify-lane --files README.md docs/plans/automation-roadmap.md docs/plans/current-state-baseline.md docs/plans/phase-execution-queue.md docs/plans/phase-58-route-readiness-evidence-gate-2026-05-20.md backend/tests/test_phase58_route_readiness_gate.py
• npm run build --prefix frontend
• python scripts/smoke_phase58_route_readiness_web.py --timeout 60
• ./make.ps1 smoke
• ./make.ps1 test
• ./make.ps1 eval-demo
• python -m backend.app.cli audit-phase phase1
• python -m backend.app.cli audit-phase phase2
• python -m backend.app.cli audit-phase phase3

Review

• read-only subagent review completed; the only conditional finding was missing frontend build evidence, now addressed by npm run build before rerunning the Phase 58 route smoke