[M0] Bootstrap: verify initialized canon shell

[blackboxprogramming]

M0 Bootstrap Verification

Repo:
BlackRoad-OS-Labs/prototype-sandbox

Purpose:
Unfinished ideas, throwaway prototypes, and isolated experiments.

Goal:
Verify this repo is an initialized BlackRoad canon shell and ready for future real work.

Checklist:

• README.md exists and matches repo purpose
• CANON_REPO.json exists
• LICENSE_POLICY.md exists
• .gitignore exists
• receipts/INIT-20260520.md exists
• main branch exists
• blackroad-lab branch exists
• labels exist
• topics exist
• milestones exist
• repo status is honest: initialized shell, not implemented product

Honesty:
This issue does not claim working product functionality.
It only tracks bootstrap verification.

Expected receipt:
Add or link a receipt when M0 verification is complete.