fix(config): align with Composer's ConfigCommand pipeline

- A1: stub auth keys (bitbucket-oauth.X etc.) with actionable error
- A2: audit.ignore / audit.ignore-abandoned writers with --json/--merge
- A3: scripts.X writer (scalar vs array) and --unset support
- A4: top-level --unset fallback for unknown single-segment keys
- A5: bare --unset extra / suggest / audit support
- A6/A13: disable-tls enable/disable user-visible messages
- A7: editor fallback chain (editor/vim/vi/nano/pico/ed)
- A8: --editor --auth opens auth.json
- A9: silent exit 0 when no setting-key and no --list
- A10: cache-files-maxsize regex validation
- A11: cafile/capath existence check + "null" clearing
- A14: merge_json_values object merge uses existing-wins (PHP `+`)
- A16: repositories.<name>.url sub-path support
- A17: wording "cannot" → "can not" to match Composer exactly
- A19: add_repository normalizes assoc repos, injects name field,
       strips stale disable entries

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/crates/mozart/tests/cli_config.rs b/crates/mozart/tests/cli_config.rs
index e433653..29d20ff 100644
--- a/crates/mozart/tests/cli_config.rs
+++ b/crates/mozart/tests/cli_config.rs
@@ -29,12 +29,14 @@ fn test_config_single_key() {
 }
 
 #[test]
-fn test_config_no_key_fails() {
+fn test_config_no_key_silent_success() {
+    // Mirrors Composer 220-223: no setting-key and no --list → silent exit 0
     let project = common::copy_fixture_to_temp("minimal");
     common::mozart_cmd()
         .arg("config")
         .arg("--working-dir")
         .arg(project.path())
         .assert()
-        .failure();
+        .success()
+        .stdout("");
 }