Add Obsidian package management proposal

Development Fund Proposal Submission

Proposal file: /proposals/2026-07-Obsidian-Package-Distribution.md

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Summary

Obsidian is proposing a scheme for distribution of packages and their metadata, including a shared repository for keys of publishers and auditors, a repository of metadata about audit statuses and source/binary hash relationships, a website for package discovery and documentation, and a dpm plugin for verification of audit status as well as hermetic reproducible builds via nix.

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Checklist

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

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Notes for Reviewers

(Add anything the Tech & Ops Committee should pay attention to.)