punk-supervisor: parallel tasks on same repo overwrite each other (no worktree isolation)

[t3chn]

Problem

When punk-supervisor dispatches multiple tasks targeting the same project directory, all agents write to the same working copy simultaneously. The last agent to finish overwrites files changed by earlier agents.

Reproduction

1. Create 3 tasks for the same project (adjutant):
   • Task A: create src/db.rs + modify src/main.rs
   • Task B: create src/cli.rs + modify src/main.rs
   • Task C: create src/init.rs + modify src/main.rs
2. All 3 dispatched in parallel (MAX_SLOTS=5)
3. Result: only last agent's main.rs survives. Other agents' changes to shared files are lost.

Expected

Each task should run in an isolated git worktree. On completion: merge or present diff for review.

Workaround

Don't dispatch parallel tasks to the same repo, or manually sequence them.

[t3chn]

Specpunk issue admission

• policy: incident_admission_v1
• decision: close_now
• source_kind: unknown
• has_runtime_report: false
• has_deterministic_evidence: false
• has_runtime_marker: false
• duplicate_or_resolved: false
• high_severity_marker: false
• targets_legacy_surface: true
• targets_active_core_surface: false
• targets_later_track: true
• indicates_core_blocker: true
• targets_cut_surface: false

Matched runtime markers

• none

Reasons

• issue targets legacy/decommissioned surfaces: references decommissioned punk-supervisor surface, references legacy supervisor slot scheduler

Only core_now issues are eligible for immediate core-stabilization work intake. defer_after_core stays open but outside the active loop. close_now is the close-now path.