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## Why Multi-environment turns can run against different filesystems, so a single thread-wide workspace-root list cannot accurately describe every selected environment. ## What changed - Add optional `runtimeWorkspaceRoots` to each app-server environment selection. Omitted roots default to that environment's `cwd`, while an empty list selects no roots. - Carry environment-native roots through turn selection, model-visible context, permission materialization, and tool sandboxing. - Keep the top-level `runtimeWorkspaceRoots` field as a compatibility input when constructing default environment selections; explicit selections use their own roots. ## Testing - Cover thread and turn API defaults, overrides, empty roots, and schema round-tripping. - Verify foreign roots remain model-visible and remote execution applies the target environment's roots before sandbox selection. GitOrigin-RevId: c6e7a62883c45c676c153055f46a55ee15a323a4