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Uses MeshLLM built-in `mesh` collective intelligence / Mixture of Agents when Buzz Auto sees two or more distinct physical models. With zero or one model, Auto remains ordinary `auto`. This is an alternative way to improve tool responses, accuracy, and resistance to hallucination when a high-latency distributed mesh contains diverse models. Models and members may come and go: collective routing enables only after stable capacity, drops on confirmed contraction, and can recover later. Mesh-specific failures retry once through ordinary Auto. This update also pins MeshLLM to a v0.73.1-compatible backport of [MeshLLM #1074](https://github.com/Mesh-LLM/mesh-llm/pull/1074), so client-only Buzz nodes cannot enter model election or download a remote provider model. Buzz preserves the selected local sharing model and switches an existing client to sharing across a controlled app restart, retaining one runtime and one `:9337` / `:3131` pair per machine. Validation: - Full local `just ci` passes on the cleaned branch. - MeshLLM host-runtime suite: 1,568 passed, 0 failed; strict Clippy passes. - Buzz desktop Tauri suite with `mesh-llm`: 1,721 passed, 0 failed; strict feature Clippy passes. - Playwright covers client-to-share using the saved local model and no destructive stop. - Packaged two-machine testing proved single-model routing, dual-model collective routing, tool-markup fallback, and runtime reuse. - Packaged client-only recheck routed a real Mini Buzz turn through M5 while Mini stayed `is_client=true`, `is_host=false`, hosted no models, and created no Gemma cache. Builds on the recovery work merged in #2823; this PR does not duplicate it. --------- Signed-off-by: Michael Neale <michael.neale@gmail.com> Signed-off-by: Tyler Longwell <tlongwell@block.xyz> Co-authored-by: Michael Neale <michael.neale@gmail.com> Co-authored-by: npub1qyvc0c5kl4gqv2fd97fsk46tu378sqgy35vc83rvgfwne90sel7s0ed67d <011987e296fd5006292d2f930b574be47c7801048d1983c46c425d3c95f0cffd@buzz.block.builderlab.xyz> Co-authored-by: Tyler Longwell <tlongwell@block.xyz>