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ebe99a46e8
Addresses point 3 of [previous comment](https://github.com/block/buzz/pull/7793#pullrequestreview-5333444423) "3. Fail fast on a bad BUZZ_OPERATOR_LISTENERS (config.rs:857)" ## Summary - Propagate malformed `BUZZ_OPERATOR_LISTENERS` values from `Config::from_env` as `ConfigError`, including invalid UTF-8. - Update startup config tests to assert returned errors and restore the original admin warning capture helper, removing the shared helper introduced only for listener log assertions. - Cover valid and absent listener values through `Config::from_env`. ## Context Follow-up to the review of #7793 specifically [reverting some config logging parts](https://github.com/block/buzz/pull/7793/changes#diff-eaa0eeb209ff1ad6212ffa56d3a983bb732858647c9fb227ef7483a3363b5a71). Invalid listener configuration currently logs an error and silently disables listener delivery. ## Verification - `cargo fmt --all -- --check` passed with Hermit. Signed-off-by: Implementor <691cca7a870db1dad6990d5938d1b4a2a2ca9647ca81290b536c17b06b2e473f@buzz.block.builderlab.xyz> Co-authored-by: Implementor <691cca7a870db1dad6990d5938d1b4a2a2ca9647ca81290b536c17b06b2e473f@buzz.block.builderlab.xyz>