feat(pi_agent): make Pi Agent default for HEARTBEAT#3

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ryaneggz wants to merge 3 commits intomainfrom

feat/pi-agent-default-heartbeat

Commits on Mar 28, 2026

docs: add implementation plan for pi agent default heartbeat

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claude
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feat(pi_agent): make Pi Agent default for HEARTBEAT

ryaneggz
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claude
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feat(heartbeat): add agent fallback chain (pi → claude → codex)

ryaneggz
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claude
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