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## Summary Add Unity Catalog model-service discovery to `buzz-agent` Databricks v2, preserve full Unity Catalog FQNs through ACP model discovery, route model services through MLflow chat, and add the optional `DATABRICKS_MODEL_FILTER` visibility filter. The resilience follow-up bounds each catalog attempt across headers, bounded body reads, and JSON parsing; retries transient 499/5xx, transport/body failures, malformed JSON, and attempt timeouts; and emits only safe catalog/status diagnostics. ## Validation The live validation and test gates below were run on the pre-rewrite tip `1cf6c66e7c5bf9a00c357bda24df48e3beeb310b`. The rewritten tip `0364cf44f3eb5cfbd5771b0a0dd7868ce0ad2c19` has identical trees for both commits, so the attribution rewrite changes no tested code. - 31 catalog tests passed - 19 Databricks OAuth/routing integration tests passed - `cargo check -p buzz-agent` passed - `cargo clippy -p buzz-agent --all-targets -- -D warnings` passed - `cargo fmt --check` passed - `git diff --check` passed - Desktop Tauri validation passed through the repository-supported setup path, including 2,777 library tests and auxiliary terminal suites The full `buzz-agent` package has one separately reproduced pre-existing failure: `regressions::cancel_kills_inflight_tool_via_mcp_notification`, failing on both baseline `eb8e97cfe` and the follow-up worktree. No Databricks path reaches that test. The live validation proves discovery and ACP exposure, not inference against every listed model. --------- Signed-off-by: Kalvin Chau <kalvin@block.xyz> Signed-off-by: am <6e30cd56c30e030cd31bb0939b94a7c257c9a09d5ba2d92cf2735da45629f248@buzz.block.builderlab.xyz> Co-authored-by: am <6e30cd56c30e030cd31bb0939b94a7c257c9a09d5ba2d92cf2735da45629f248@buzz.block.builderlab.xyz>