Enforce Rust coding standards via Clippy (#927)

* chore(clippy): apply strict workspace lint settings

* docs: require workspace lint inheritance for new crates

* docs: clarify crate lint placement

CLAUDE.md

@@ -1 +1,5 @@
 Read [AGENTS.md](AGENTS.md) first: it is the guide for every agent and contributor working in this repository.
+
+New workspace crates must include `[lints] workspace = true` in `Cargo.toml` to inherit
+`[workspace.lints]`. Production crate roots must declare the required crate-level lint attributes
+before modules or other crate items; crate-level `//!` documentation may precede them.

Cargo.toml

@@ -13,6 +13,9 @@ repository = "https://github.com/storytold/craft-launcher"
 unsafe_code = "forbid"
 
 [workspace.lints.clippy]
+cognitive_complexity = "deny"
+too_many_arguments = "deny"
+wildcard_imports = "deny"
 dbg_macro = "warn"
 todo = "warn"
 

clippy.toml

@@ -5,3 +5,4 @@ allow-indexing-slicing-in-tests = true
 disallowed-types = [
     { path = "egui::ComboBox", reason = "use craft_ui::ComboBox: egui's combo box menu can't grow back while open (egui#5225)" },
 ]
+cognitive-complexity-threshold = 30