Enforce workspace Clippy standards and document lint policy

CLAUDE.md

@@ -3,6 +3,10 @@
 Read [AGENTS.md](AGENTS.md) first: its rules (asset policy, clean room, never crash) bind you and
 win over anything here.
 
+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.
+
 ## Start every session
 1. Read `plan/STATUS.md`, then the current milestone in `plan/execution-plan.md`.
 2. Read `../../craftrules/AGENTS.md` and the standards it lists for your task.

Cargo.toml

@@ -80,9 +80,11 @@ arboard = { version = "3.6", default-features = false }
 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"
 type_complexity = "allow"
 self_named_constructors = "allow"
 large_enum_variant = "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

@@ -5,5 +5,8 @@ edition.workspace = true
 license.workspace = true
 publish = false
 
+[lints]
+workspace = true
+
 [dependencies]
 serde_json = { workspace = true }