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## Why Credential brokerage must retain trusted destination hints even when shell environment policy hides them from child processes. Snapshot replay also needs to preserve credential aliases when tokens are short or captured dummy values change. ## What changed - Add `features.network_proxy.credentials` and preserve provider settings when toggling the proxy. Prevent project configuration from overriding providers or their credential and destination environment variables. - Use provider metadata throughout snapshot capture and replay, and pass hidden destination context to the broker without exposing it in the child environment. - Rewrite aliases containing short credentials or previously captured dummies, respecting environment filters and explicit overrides. - Preserve case-distinct `shell_environment_policy.set` keys so Windows credential ambiguity checks survive configuration merging and permission profile changes. - Restore independent MITM settings when credential brokerage is disabled. ## Testing Add regression coverage for custom providers, hidden destination hints, Bash and Zsh alias replay, configuration edits and merging, Windows ambiguity handling, and credential protection during approved execution. GitOrigin-RevId: b2bd935d2d8555be56baf8feb1a8e5b3a0c666bc