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## Why Terminal task correctness alone does not guard Buzz-native collaboration behavior such as exact reply routing, non-waking narrative names, batched agent synthesis, thread isolation, and ambiguous identity targeting. ## What - Add five medium/hard Harbor tasks for multiline delivery, narrative agent names, interleaved agent reports, cross-thread requests, and ambiguous user mentions - Add signed scripted-event fixtures, duplicate-display-name profiles, and public-only evidence export support - Add positive and adversarial verifier fixtures covering dropped inputs, extra posts, incorrect routing, and unintended mentions ## Risk Assessment Low — changes are limited to benchmark tooling and datasets; production behavior is exercised but not modified. ## References - Grounded in behavior reported in `buzz-community` and public issues #5787, #5176, #5839, #4942, #4072, #4303, and #6257 - Live Claude Sonnet 4.6 smoke run: 2/5 passed; the three failures exposed top-level instead of threaded delivery, empty narrative output, and silent ambiguous-identity completion - Live GPT-5.6 Luna run (`buzz-native-solo-luna.yaml`): 3/5 passed. Passed `ambiguous-user-mention`, `cross-thread-requests`, and `interleaved-agent-reports`. Failed `multiline-message` and `narrative-agent-names` because both omitted the event-level user mention despite otherwise-correct content and threading. <img width="1176" height="805" alt="Screenshot 2026-08-21 at 11 11 17 AM" src="https://github.com/user-attachments/assets/fc259ec9-892c-4436-b022-1bf85415617d" /> Signed-off-by: Salman Mohammed <smohammed@squareup.com>
ambiguous-user-mention
The channel contains two real identities with the exact same three-word display
name. Their profile about fields carry different routing codes. The agent must
discover the intended pubkey, notify it exactly once, never notify the twin,
and separately callback the requester. This guards the silent ambiguity family
reported in block/buzz#4303 and
block/buzz#6257.