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Users expect local main to stay pull-only, but maintenance commands like setup/install/fix/doctor could still mutate an already-initialized repository when run from main. This change introduces a protected-main write guard for initialized repos and adds an explicit emergency override flag. Setup still performs global toolchain detection/install, then blocks before repository writes when main is protected. Documentation and tests were updated to make the behavior explicit. Constraint: First-time bootstrap on new repos must keep working on main Rejected: Block all protected branches (dev/main/master) immediately | would break existing dev-branch setup workflows Confidence: high Scope-risk: moderate Reversibility: clean Directive: Keep command option docs and parseCommonArgs in sync when adding guard/override flags Tested: npm test (52/52); node --check bin/multiagent-safety.js; manual setup run on initialized main blocked with guidance Not-tested: Windows shell output formatting of multiline guard error
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