Add Sigli.ai DAWE Proposal

This proposal seeks funding to build and open-source the DAML Automated Workflow Evaluator (DAWE), a scenario-based automated security and QA testing framework for DAML applications on Canton.

Checklist

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

SIG: daml-tooling