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### What changed? After a new mobile invite claim succeeds, Buzz now best-effort ensures membership in the same public starter channels as desktop: - `#general` - `#welcome-everyone` Missing starters use desktop's deterministic per-relay IDs and exact public channel configuration, so concurrent mobile and desktop setup converges safely. Setup failures do not invalidate or retry an already successful invite claim, and failure for one starter does not block the other. The success sheet offers **Continue to #welcome-everyone** when that channel is available. Mobile does not create the private `Welcome` channel because it cannot provision the desktop Welcome agents that make that channel useful. This PR is stacked on #6145 because it deliberately reuses that PR's open-channel directory and join behavior. Once #6145 merges, this PR can be retargeted to `main` without changing its BUZZ-12 diff. Fixes [BUZZ-12](https://linear.app/squareup/issue/BUZZ-12/bug-community-appears-empty-after-using-invite-link-on-mobile). ### How is it tested? - Desktop/mobile deterministic starter-ID parity coverage. - Existing-channel join and missing-channel creation coverage. - Duplicate-create convergence and per-channel failure isolation coverage. - Invite success remains successful when starter setup fails. - Widget coverage for continuing directly into `#welcome-everyone`. - Focused invite/deep-link tests: 23 passed. - `just mobile-check`: passed. - `just mobile-test`: 1,483 passed. - Pre-push repository checks: passed. --------- Signed-off-by: Tom Brow <tomb@block.xyz> Co-authored-by: Codex <noreply@openai.com>