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🤖 ## Summary When two identities share a display name, Buzz mobile shows the same label for both. A reader cannot tell a person from an agent, or one person's agent from another's. For example, a channel can show three agents and one human all named "murderbot". This PR adds the naming rules that fix this, without changing any screen yet. It ports the contextual identity-name contract (v1) from the desktop app to Dart. Given the identities shown together, the resolver gives each public key a distinct label: - A human keeps the plain name. Agents that share it get a qualifier. - The viewer's own agents are named before other people's agents. - An agent is qualified by its owner's name first ("Wes's Honey"). A short public-key suffix is added only if that is still ambiguous ("baxen's murderbot · xa8v"). It also adds two providers that screens will use: - `channelIdentityNamesProvider` compares names against a channel's members, plus any referenced non-member such as an old author or an outside mention. - `watchIdentityNames` compares a set of identities shown together outside a channel, and loads their profiles. The next PRs in this stack connect these to the screens. Part 1 of 3: #7894 (resolver) → #7895 (conversations) → #7896 (lists, Search, Pulse). ### Related issue Related to #2910 (default "Fizz" agents from different users collide in one channel). ### Testing - The contract's 31 portable fixture cases run against the production resolver. The fixture file is copied unchanged from the contract, so reviewers can skip it. - Unit tests cover owner and suffix qualification, the viewer's own identities, and invalid public keys. - Provider tests check that a channel keeps its names while its roster reloads, that an offline cached bot still counts as an agent, and that changing relay or account never shows the old roster. - `flutter analyze` is clean. No UI change, so there are no screenshots. --------- Signed-off-by: Logan Johnson <loganj@squareup.com> Co-authored-by: Larry <627498bd4bd1f281a16431e3c6cce3b5c25b6692798c78672298aefbf2f8f8b5@buzz.block.builderlab.xyz>