Fix clippy warnings and fmt issues to pass CI

Replace expect/unwrap calls with safe alternatives, add Default impls
for parser structs and Toasts, fix redundant closures, collapse nested
ifs, remove unused import, and allow recursive-only-self/too-many-args
lints in compliance-graph.

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

compliance-graph/src/graph/community.rs

@@ -109,8 +109,8 @@ pub fn detect_communities(code_graph: &CodeGraph) -> u32 {
     let mut comm_remap: HashMap<u32, u32> = HashMap::new();
     let mut next_id: u32 = 0;
     for &c in community.values() {
-        if !comm_remap.contains_key(&c) {
-            comm_remap.insert(c, next_id);
+        if let std::collections::hash_map::Entry::Vacant(e) = comm_remap.entry(c) {
+            e.insert(next_id);
             next_id += 1;
         }
     }
@@ -137,8 +137,7 @@ pub fn detect_communities(code_graph: &CodeGraph) -> u32 {
 
 /// Apply community assignments back to code nodes
 pub fn apply_communities(code_graph: &mut CodeGraph) -> u32 {
-    let count = detect_communities_with_assignment(code_graph);
-    count
+    detect_communities_with_assignment(code_graph)
 }
 
 /// Detect communities and write assignments into the nodes
@@ -235,8 +234,8 @@ fn detect_communities_with_assignment(code_graph: &mut CodeGraph) -> u32 {
     let mut comm_remap: HashMap<u32, u32> = HashMap::new();
     let mut next_id: u32 = 0;
     for &c in community.values() {
-        if !comm_remap.contains_key(&c) {
-            comm_remap.insert(c, next_id);
+        if let std::collections::hash_map::Entry::Vacant(e) = comm_remap.entry(c) {
+            e.insert(next_id);
             next_id += 1;
         }
     }

compliance-graph/src/graph/embedding_store.rs

@@ -96,17 +96,15 @@ impl EmbeddingStore {
         };
 
         if status == EmbeddingBuildStatus::Completed || status == EmbeddingBuildStatus::Failed {
-            update
-                .get_document_mut("$set")
-                .unwrap()
-                .insert("completed_at", mongodb::bson::DateTime::now());
+            if let Ok(set_doc) = update.get_document_mut("$set") {
+                set_doc.insert("completed_at", mongodb::bson::DateTime::now());
+            }
         }
 
         if let Some(msg) = error_message {
-            update
-                .get_document_mut("$set")
-                .unwrap()
-                .insert("error_message", msg);
+            if let Ok(set_doc) = update.get_document_mut("$set") {
+                set_doc.insert("error_message", msg);
+            }
         }
 
         self.builds

compliance-graph/src/graph/engine.rs

@@ -133,10 +133,10 @@ impl GraphEngine {
     }
 
     /// Try to resolve an edge target to a known node
-    fn resolve_edge_target<'a>(
+    fn resolve_edge_target(
         &self,
         target: &str,
-        node_map: &'a HashMap<String, NodeIndex>,
+        node_map: &HashMap<String, NodeIndex>,
     ) -> Option<NodeIndex> {
         // Direct match
         if let Some(idx) = node_map.get(target) {

compliance-graph/src/lib.rs

@@ -1,3 +1,6 @@
+#![allow(clippy::only_used_in_recursion)]
+#![allow(clippy::too_many_arguments)]
+
 pub mod graph;
 pub mod parsers;
 pub mod search;

compliance-graph/src/parsers/javascript.rs

@@ -7,6 +7,12 @@ use tree_sitter::{Node, Parser};
 
 pub struct JavaScriptParser;
 
+impl Default for JavaScriptParser {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl JavaScriptParser {
     pub fn new() -> Self {
         Self

compliance-graph/src/parsers/python.rs

@@ -7,6 +7,12 @@ use tree_sitter::{Node, Parser};
 
 pub struct PythonParser;
 
+impl Default for PythonParser {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl PythonParser {
     pub fn new() -> Self {
         Self

compliance-graph/src/parsers/rust_parser.rs

@@ -7,6 +7,12 @@ use tree_sitter::{Node, Parser};
 
 pub struct RustParser;
 
+impl Default for RustParser {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl RustParser {
     pub fn new() -> Self {
         Self

compliance-graph/src/parsers/typescript.rs

@@ -7,6 +7,12 @@ use tree_sitter::{Node, Parser};
 
 pub struct TypeScriptParser;
 
+impl Default for TypeScriptParser {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl TypeScriptParser {
     pub fn new() -> Self {
         Self