Proposal: Canton Migration Lens (CML).md

Development Fund Proposal Submission

Proposal file: Link to the proposal added in this PR /proposals/Canton-Migration-Lens-(CML).md

---

Summary

Canton upgrades and synchronizer migrations are high-stakes moments where small mistakes can turn into downtime and long incident threads. Canton Migration Lens (CML) is a lightweight, offline-first tool that validates ACS snapshot exports and produces deterministic, redacted “migration evidence” (inventory, fingerprint, diff) so operators can prove what state they moved; before and after a change without touching production state.

---

Checklist

• [x] Proposal file added under /proposals/
• [x] Milestones and funding amounts defined
• [x] Acceptance criteria included
• [x] Alignment with Canton priorities described