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/agents/pool/stop.rs

@@ -4,8 +4,8 @@ use crate::slog_error;
 use std::path::Path;
 
 use super::super::{AgentEvent, AgentStatus};
-use super::types::composite_key;
 use super::AgentPool;
+use super::types::composite_key;
 
 impl AgentPool {
     /// Stop a running agent. Worktree is preserved for inspection.