Add workbench release readiness checklist

Author: xiangtinghe616-blip

frontend/design/UI_RELEASE_CHECKLIST.md

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+# UI Release Checklist
+
+## Current UI Stage
+
+The current frontend is an interactive alpha workbench.
+
+It is no longer a static dashboard or CSV output viewer. It now supports a break-resolution workflow:
+
+- Priority queue
+- Queue filters
+- Search
+- Next break
+- Local staged state
+- Evidence triage
+- Bank side vs ledger side comparison
+- Drill-down panels
+- Related candidate evidence
+- Candidate decision workflow
+- Structured action log preview
+- Candidate guardrails
+- Generated v3 output data
+
+## Public Demo Goal
+
+The public demo should communicate in under 30 seconds:
+
+1. This is a reconciliation workbench, not a dashboard.
+2. The system automates clear matches.
+3. Exceptions are prioritized.
+4. Evidence is shown by review dimension.
+5. Candidates are hypotheses, not final matches.
+6. Analysts remain responsible for final decisions.
+7. Actions produce an audit-style preview.
+
+## Must Work Before Public Sharing
+
+- Vercel page loads successfully.
+- Main workbench page renders.
+- Data source shows generated v3 output.
+- Queue filters work.
+- Search works.
+- Next break works.
+- Evidence triage renders.
+- Drill-down panels expand.
+- Candidate Available filter shows relevant breaks.
+- Candidate cards render.
+- Review / Accept / Reject candidate updates the Action Panel.
+- Accept / Reject candidate requires analyst note.
+- Action log preview renders structured fields.
+- Frontend build passes.
+
+## Known Limitations
+
+- Actions are frontend-only staged previews.
+- No real action submission API exists yet.
+- Staged state is not persisted.
+- Candidate association is synthetic/demo oriented.
+- UI is still being refined toward a Salt-aligned institutional finance style.
+- This is not production software.
+
+## Next UI Priorities
+
+1. Visual system polish
+2. Action panel density and hierarchy
+3. Candidate section visibility
+4. Better public demo screenshot
+5. README and Vercel link documentation
+6. Optional deployment branch strategy