fix: add --all to cargo fmt in script/test and autoformat codebase

cargo fmt without --all fails with "Failed to find targets" in
workspace repos. This was blocking every story's gates. Also ran
cargo fmt --all to fix all existing formatting issues.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/src/chat/transport/matrix/assign.rs

@@ -17,10 +17,7 @@ use std::path::Path;
 #[derive(Debug, PartialEq)]
 pub enum AssignCommand {
     /// Assign the story with this number to the given model.
-    Assign {
-        story_number: String,
-        model: String,
-    },
+    Assign { story_number: String, model: String },
     /// The user typed `assign` but without valid arguments.
     BadArgs,
 }
@@ -96,9 +93,7 @@ pub async fn handle_assign(
         match crate::chat::lookup::find_story_by_number(project_root, story_number) {
             Some(found) => found,
             None => {
-                return format!(
-                    "No story, bug, or spike with number **{story_number}** found."
-                );
+                return format!("No story, bug, or spike with number **{story_number}** found.");
             }
         };
 
@@ -282,11 +277,8 @@ mod tests {
     fn extract_assign_command_multibyte_prefix_no_panic() {
         // "xxxx⏺ assign 42 opus" — ⏺ (U+23FA) is 3 bytes, starting at byte 4.
         // "@timmy" has len 6 so text[..6] lands inside ⏺ — panics without the fix.
-        let cmd = extract_assign_command(
-            "xxxx\u{23FA} assign 42 opus",
-            "Timmy",
-            "@timmy:home.local",
-        );
+        let cmd =
+            extract_assign_command("xxxx\u{23FA} assign 42 opus", "Timmy", "@timmy:home.local");
         assert_eq!(cmd, None);
     }
 
@@ -453,7 +445,8 @@ mod tests {
         );
         // Should indicate a restart occurred (not just "will be used when starts")
         assert!(
-            response.to_lowercase().contains("stop") || response.to_lowercase().contains("reassign"),
+            response.to_lowercase().contains("stop")
+                || response.to_lowercase().contains("reassign"),
             "response should indicate stop/reassign: {response}"
         );
     }