refactor: apply zero-unwrap policy and optimize locks in store.rs and handlers

dedup.py

@@ -0,0 +1,14 @@
+import re
+
+with open("server/src/handlers.rs", "r", encoding="utf-8") as f:
+    text = f.read()
+
+pattern = r'"(list_milestones|list_pinned_files|read_handoff_memos)" => \{\s*let req = parse_tool!\(args, id, ([a-zA-Z]+)\);\s*let mut [a-zA-Z_]+ = self\.state\.([a-zA-Z_]+)\.read\(\);\s*if let Some\(ns\) = req\.namespace \{\s*[a-zA-Z_]+\.retain\(\|.\| \w+\.namespace == ns\);\s*\}\s*let data = serde_json::to_string\(&[a-zA-Z_]+\)\.unwrap_or_default\(\);\s*Ok\(data\.to_string\(\)\)\s*\}'
+
+def repl(m):
+    return f'"{m.group(1)}" => handle_list_with_namespace!(self, {m.group(3)}, {m.group(2)}, args, id),'
+
+new_text = re.sub(pattern, repl, text)
+
+with open("server/src/handlers.rs", "w", encoding="utf-8") as f:
+    f.write(new_text)