chore(agents): recheck pi-subagents tasks support before next version bump past 0.40.0

[jinyeow]

What to check

Upstream pi-subagents (github.com/nicobailon/pi-subagents, current main branch) has deprecated the top-level chain/tasks/parallel inputs in favor of workflowScript with runs.all([...]). The pinned version in pi/settings.json:14 (0.40.0) still supports tasks, which ai-agents/skills/storm-research/DISPATCH.md's Pi example relies on.

What to do

When pi/settings.json's pi-subagents pin is next bumped past 0.40.0:

• Reverify tasks still works against the new version, or
• Migrate DISPATCH.md's Pi dispatch example from { tasks: [...] } to workflowScript/runs.all(...).
• Confirm storm-research still dispatches correctly on Pi after the change.

Context

Source research: #95 (closed as duplicate of #172 — this ticket captures the one open risk that research surfaced).