Initial commit with dev backbone template

.github/copilot-instructions.md

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+Follow `AGENTS.md` and `SKILLS.md`.
+
+Rules:
+- Use the PLAN → IMPLEMENT → VERIFY → REVIEW loop.
+- Keep model selection on Auto unless AGENTS.md role routing says to override for that role.
+- Never claim "done" unless DoD passes (`./scripts/dod.sh` or `\scripts\dod.ps1`).
+- Keep diffs small and add/update tests when behavior changes.
+- Prefer reproducible commands and cite sources for generated documents.