v0.10.7 - Update Determinism, Strict Execution Order & Modal Hardening

Update & Setup Determinism: Strict Execution Order & Modal Hardening

• Strict Porting Sequence (docs/update-prompt.md, docs/setup-prompt.md): Enforced a strict execution order (copy engine -> populate _product.py and tool adapters -> run selftest/doctor). Prevents premature hook selftest failures caused by unported placeholder constants.
• Update Modal Elimination (docs/setup-prompt.md, docs/update-prompt.md): Scoped domain references approval modals (ask_question) strictly to first-time installations, completely eliminating redundant modal interruptions during update workflows where references are already preserved from backup.
• Single Diagnostic Execution: Hardened instructions to prevent duplicate background task spawning during diagnostics.
• Local Hooks Privacy Note: Clarified that .githooks/ is automatically excluded in .git/info/exclude to preserve clean shared team working trees.