fix(mediation): duplicate greeting, biased invitation, summary→supersede panic#49

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fix/phase3-greeting-and-summary-close

Apr 28, 2026

Commits on Apr 28, 2026

fix(mediation): three production bugs from 2026-04-27 Alice/Bob test trade
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review: drop stale "always identify yourself" reference + lock filter divergence
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fix(reasoning): round-0 ask_clarification regression on empty transcripts
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