P0.7: Fix cargo fmt and clippy warnings for CI smoke

cargo fmt reformats dump.rs match arms; credentials.rs needs #[allow(dead_code)]
on an unused public helper.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

crates/miroir-ctl/src/commands/dump.rs

@@ -63,28 +63,27 @@ pub enum DumpSubcommand {
 
 pub async fn run(cmd: DumpSubcommand) -> Result<(), Box<dyn std::error::Error>> {
     match cmd {
-        DumpSubcommand::Import { file, index, mode, .. } => {
-            Err(format!(
-                "Dump import is not yet implemented. See bead miroir-zc2.5 for tracking.\n\n\
+        DumpSubcommand::Import {
+            file, index, mode, ..
+        } => Err(format!(
+            "Dump import is not yet implemented. See bead miroir-zc2.5 for tracking.\n\n\
                  For dump compatibility information, see:\n\
                  docs/dump-import/compatibility-matrix.md\n\n\
                  Requested:\n\
                  File: {file}\n\
-                 Index: {index}\n\
+                 Index: {index:?}\n\
                  Mode: {mode}"
-            ).into())
-        }
-        DumpSubcommand::Export { output, index, .. } => {
-            Err(format!(
-                "Dump export is not yet implemented. See bead miroir-qon for tracking.\n\n\
+        )
+        .into()),
+        DumpSubcommand::Export { output, index, .. } => Err(format!(
+            "Dump export is not yet implemented. See bead miroir-qon for tracking.\n\n\
                  Requested:\n\
                  Output: {output}\n\
                  Index: {index:?}"
-            ).into())
-        }
-        DumpSubcommand::Analyze { file } => {
-            Err(format!(
-                "Dump analysis is not yet implemented. See bead miroir-zc2.5 for tracking.\n\n\
+        )
+        .into()),
+        DumpSubcommand::Analyze { file } => Err(format!(
+            "Dump analysis is not yet implemented. See bead miroir-zc2.5 for tracking.\n\n\
                  This command will analyze {file} and report:\n\
                  - Whether streaming mode can reconstruct the dump\n\
                  - Any field conflicts (e.g., existing `_miroir_shard`)\n\
@@ -92,7 +91,7 @@ pub async fn run(cmd: DumpSubcommand) -> Result<(), Box<dyn std::error::Error>>
                  - Recommended import mode\n\n\
                  See compatibility matrix:\n\
                  docs/dump-import/compatibility-matrix.md"
-            ).into())
-        }
+        )
+        .into()),
     }
 }

crates/miroir-ctl/src/credentials.rs

@@ -113,6 +113,7 @@ fn load_from_credentials_file() -> Result<Option<String>, CredentialError> {
 }
 
 /// Get the credentials file path for diagnostic messages
+#[allow(dead_code)]
 pub fn credentials_file_path() -> Option<PathBuf> {
     let config_dir = dirs::config_dir()?;
     let miroir_config_dir = config_dir.join("miroir");