chore: Update clippy rules and add test cases to increase code coverage

Cargo.toml

@@ -19,6 +19,7 @@ unsafe_code = "forbid"
 unused_mut = "warn"
 noop_method_call = "warn"
 unused_import_braces = "warn"
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(coverage_nightly)'] }
 
 [workspace.lints.clippy]
 # See clippy rules details https://rust-lang.github.io/rust-clippy/master/index.html

clippy.toml

@@ -0,0 +1,33 @@
+# Clippy configuration for GTS-Rust
+avoid-breaking-exported-api = false
+
+check-inconsistent-struct-field-initializers = true
+
+lint-commented-code = true
+
+# Type complexity threshold (default is 250)
+type-complexity-threshold = 190
+
+# Cognitive complexity threshold (default is 25)
+cognitive-complexity-threshold = 25
+
+# Function length threshold (default is 100)
+too-many-lines-threshold = 200
+
+allow-expect-in-tests = true
+allow-unwrap-in-tests = true
+
+# Stricter thresholds for LLM-generated code
+single-char-binding-names-threshold = 4
+large-error-threshold = 128
+
+# Stack size limits
+stack-size-threshold = 512000
+
+# Struct field limits
+max-struct-bools = 2
+
+# Disallowed types (prevent common mistakes)
+disallowed-types = [
+    { path = "std::collections::LinkedList", reason = "Use Vec instead - LinkedList has poor cache locality" },
+]

gts-cli/Cargo.toml

@@ -33,3 +33,7 @@ atty.workspace = true
 chrono.workspace = true
 regex.workspace = true
 walkdir.workspace = true
+
+[dev-dependencies]
+tempfile = "3.8"
+tower = "0.5"