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## Summary Buzz can repeat a thread reply in later prompts after the provider already received that event as context. The old fix treated every message signed by the agent key as retained by the current provider session. That could hide an unseen heartbeat reply because independent sessions share the same signing key. This PR now removes only exact event IDs already delivered to the live ACP session. It uses bounded overfetch so removed events do not shrink the new-context window, and it preserves unseen same-key replies from other sessions. The context header reports `truncated=true` whenever session history was omitted. The harness calls `/count` only when the relay query finds a sentinel beyond its fetch window. This deliberately does not parse event IDs from shell output. A reply that the agent just published may appear once in the next context delta; after that event reaches the provider as context, later prompts omit it. --------- Signed-off-by: Salman Mohammed <smohammed@squareup.com>