Enable commit attribution by default

Promote codex_git_commit to a stable feature and enable it by default so Open
Codex commits add the configured co-author trailer without requiring users to
opt in through the experimental feature table.

Tests:
- cargo test -p codex-features codex_git_commit

Author: LEON-gittech

codex-rs/features/src/lib.rs

@@ -768,12 +768,11 @@ pub const FEATURES: &[FeatureSpec] = &[
         stage: Stage::Removed,
         default_enabled: false,
     },
-    // Experimental program. Rendered in the `/experimental` menu for users.
     FeatureSpec {
         id: Feature::CodexGitCommit,
         key: "codex_git_commit",
-        stage: Stage::UnderDevelopment,
-        default_enabled: false,
+        stage: Stage::Stable,
+        default_enabled: true,
     },
     FeatureSpec {
         id: Feature::RuntimeMetrics,

codex-rs/features/src/tests.rs

@@ -54,6 +54,12 @@ fn use_linux_sandbox_bwrap_is_removed_and_disabled_by_default() {
     assert_eq!(Feature::UseLinuxSandboxBwrap.default_enabled(), false);
 }
 
+#[test]
+fn codex_git_commit_is_stable_and_enabled_by_default() {
+    assert_eq!(Feature::CodexGitCommit.stage(), Stage::Stable);
+    assert_eq!(Feature::CodexGitCommit.default_enabled(), true);
+}
+
 #[test]
 fn undo_is_removed_and_disabled_by_default() {
     assert_eq!(Feature::GhostCommit.stage(), Stage::Removed);

docs/config.md

@@ -10,22 +10,19 @@ For a full configuration reference, see [this documentation](https://developers.
 
 Open Codex can add a [git trailer](https://git-scm.com/docs/git-interpret-trailers)
 to generated commit messages so commits make Open Codex's involvement explicit.
-This behavior is gated by the `codex_git_commit` feature flag; the top-level
-`commit_attribution` setting is only used when that feature is enabled.
+This behavior is enabled by default. The top-level `commit_attribution` setting
+can override the default trailer identity.
 
 Add the following to `~/.codex/config.toml`:
 
 ```toml
 commit_attribution = "Open Codex <hff582580@gmail.com>"
-
-[features]
-codex_git_commit = true
 ```
 
-When enabled, Open Codex appends a `Co-authored-by:` trailer using the configured
-attribution value. If `commit_attribution` is omitted, Open Codex uses
+Open Codex appends a `Co-authored-by:` trailer using the configured attribution
+value. If `commit_attribution` is omitted, Open Codex uses
 `Open Codex <hff582580@gmail.com>`. Set `commit_attribution = ""` to disable the
-trailer while leaving the feature flag enabled.
+trailer.
 
 ## OpenTelemetry Trace Metadata