All code-writing agents (gsd-executor, gsd-debugger) were dispatched
without isolation: "worktree", causing branch pollution when agents
switched branches in the shared working tree during concurrent work.
Added isolation="worktree" to all Task() dispatch sites:
- execute-phase.md: executor agent dispatch
- execute-plan.md: Pattern A executor reference
- quick.md: quick task executor dispatch
- diagnose-issues.md: debugger agent dispatch
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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