daily-fix: task.py bounded wait on live rebase detached HEAD

Overview / Motivation

Auto-filed by /daily 2026-07-03 from a /daily 2026-07-03 finding.

Goal

detect live .git/rebase-merge / rebase-apply state and bounded-wait (e.g. up to 120s) + retry before refusing

Workflow gap

• Bug observed: during a concurrent session's git pull --rebase the shared repo root sits detached for ~minutes and task.py mutations hard-refuse ('main worktree HEAD is detached; re-attach to main') — hit >=7 sessions on 2026-07-03
• Why it is a workflow gap: see candidate note
• Confidence (emitter): medium

Proposed change (candidate sketch — refine in planning)

detect live .git/rebase-merge / rebase-apply state and bounded-wait (e.g. up to 120s) + retry before refusing

Scope / surfaces

• Primary target: src/explore_persona_space/task_workflow.py, scripts/task.py
• Grep the workflow surface for the pattern before editing; list every hit in the plan.

Constraints / invariants

• Workflow-surface only; scripts/workflow_lint.py --check-asks passes; ruff on touched files passes.

Provenance

• workflow_fix_target: src/explore_persona_space/task_workflow.py, scripts/task.py
• fingerprint: a5a7c17106c7

daily finding 3 (2026-07-03): task.py hard-refused mutations during concurrent rebases (detached HEAD), >=7 sessions hit.