deny canonical for filesystem permission entries (#23493)
## Why Filesystem permission profiles used `none` for deny-read entries, which is less direct than the action the entry actually represents. This change makes `deny` the canonical filesystem permission spelling while preserving compatibility for older configs that still send `none`. ## What changed - rename `FileSystemAccessMode::None` to `Deny` - serialize and generate schemas with `deny` as the canonical value - retain `none` only as a legacy input alias for temporary config compatibility - update filesystem glob diagnostics and regression coverage to use the canonical spelling - refresh config and app-server schema fixtures to match the new wire shape ## Validation - `cargo test -p codex-protocol` - `cargo test -p codex-app-server-protocol` - `cargo test -p codex-core config_toml_deserializes_permission_profiles --lib` - `cargo test -p codex-core read_write_glob_patterns_still_reject_non_subpath_globs --lib` Earlier in the session, a broad `cargo test -p codex-core` run reached unrelated pre-existing failures in timing/snapshot/git-info tests under this environment; the targeted surfaces touched by this PR passed cleanly.
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