Enforce workspace Clippy standards and document lint policy

CLAUDE.md

@@ -22,6 +22,7 @@ EffectCraft is a clean-room, open-source, pure-Rust motion graphics and visual e
 - **Everything is agent-drivable:** every interactive widget registers an automation id; UI state is serde.
 - **Community links** (Help menu, About, header Discord button): https://discord.gg/artcraft, https://getartcraft.com, https://getartcraft.com/apps/effectcraft, https://github.com/storytold/effectcraft.
 - **Quality gates** before every commit: `cargo xtask ci` (fmt, clippy -D warnings, tests, layers, assets, wasm).
+- **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.
 - **Commits:** one task id per commit (`M6.3: trim paths`). Only green states.
 
 ## Running and looking at the app

Cargo.toml

@@ -135,9 +135,11 @@ sys-locale = "0.3"
 unsafe_code = "forbid"
 
 [workspace.lints.clippy]
+cognitive_complexity = "deny"
+too_many_arguments = "deny"
+wildcard_imports = "deny"
 dbg_macro = "warn"
 todo = "warn"
-too_many_arguments = "allow"
 needless_range_loop = "allow"
 type_complexity = "allow"
 

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

xtask/Cargo.toml

@@ -5,6 +5,9 @@ edition.workspace = true
 license.workspace = true
 publish = false
 
+[lints]
+workspace = true
+
 [dependencies]
 serde_json = { workspace = true }