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## Summary - drop the `subs` DashMap guard before mutating subscription indexes - snapshot fan-out candidate vectors so index guards are dropped before looking up `subs` - add concurrent fan-out/replacement regression coverage ## Why `fan_out_scoped` previously held an index guard while `push_match` acquired `subs`, while CLOSE and same-ID replacement held `subs` while removing from an index. The reverse ordering made an AB/BA deadlock reachable and could synchronously park all Tokio workers. ## Validation - `rustup run 1.95.0 cargo test -p buzz-relay` — 769 library tests passed, 33 ignored; 11 binary tests passed; doc tests passed - push hooks with pinned Rust 1.95 — branch-skew, repository Rust suites, and desktop Tauri suite passed - `git diff --check` ## Residual risk Fan-out now clones bounded candidate vectors before matching. This adds allocation/copy cost proportional to the indexed candidate set, in exchange for eliminating nested DashMap guards. This fixes the concrete lock cycle but does not prove every observed production wedge had this cause. --------- Signed-off-by: npub12gtutshhh76rx0jx697f32f9tffd4hhp3hx58fp4x6u4uemkm7sqf8f757 <5217c5c2f7bfb4333e46d17c98a9255a52dadee18dcd43a43536b95e6776dfa0@buzz.block.builderlab.xyz> Signed-off-by: npub1jh9wn95s0472h86ahapupaf7m6kx4v9sx2n0atj2hltcfer8k06s5n3pyf <95cae996907d7cab9f5dbf43c0f53edeac6ab0b032a6feae4abfd784e467b3f5@buzz.block.builderlab.xyz> Co-authored-by: npub12gtutshhh76rx0jx697f32f9tffd4hhp3hx58fp4x6u4uemkm7sqf8f757 <5217c5c2f7bfb4333e46d17c98a9255a52dadee18dcd43a43536b95e6776dfa0@buzz.block.builderlab.xyz> Co-authored-by: npub1jh9wn95s0472h86ahapupaf7m6kx4v9sx2n0atj2hltcfer8k06s5n3pyf <95cae996907d7cab9f5dbf43c0f53edeac6ab0b032a6feae4abfd784e467b3f5@buzz.block.builderlab.xyz>