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## Why Default read-only protections for project metadata should apply when paths such as `.git`, `.agents`, and `.codex` exist, without causing sandbox setup to materialize missing paths as ACL targets. ## What changed - Add an optional `missing_path_behavior` to filesystem sandbox entries and mark default project-metadata protections with `skip`. - Preserve the behavior through permission transforms and exec/MCP protocol serialization while keeping existing path wire variants stable. - Ignore skip-missing entries when projecting configuration or Windows sandbox overrides, while retaining explicit metadata carveouts. ## Testing - Cover protocol round trips for path and special-path entries. - Verify default metadata protections and Windows explicit carveout handling. GitOrigin-RevId: 6df13dadacdd131c44aab9f15a967c81051355c1