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## Why Temporary environment attachments for a parent turn should not become a subagent's persistent environments. Children also need to retain their configured executor bindings when their runtime is evicted and reloaded. ## What changed - Add the disabled-by-default `subagent_thread_environments` feature flag. When enabled, both subagent implementations inherit configured thread environments captured with the invoking step, excluding turn-only attachments. - Track configured bindings separately from active turn attachments, preserving pending configuration ownership and sharing completed executor startup. - Retain configured selections and bindings across idle eviction. Reload children using retained bindings when the parent changes workspace, while continuing to validate current parent roots and permissions for matching workspaces. ## Testing Extend regression coverage for configured, empty, forked, pending, and legacy inheritance; temporary attachment removal across eviction; and reload behavior with changed workspaces, deferred startup, and restricted permissions. GitOrigin-RevId: 15692ecd99deb38002014b44fd859d793bd54373