Enforce workspace Clippy standards and document lint policy

CLAUDE.md

@@ -16,7 +16,7 @@ People trust DesignCraft with their layouts; a crash loses their work. **This ou
 - **Bound recursion** (seen-sets or depth limits for nested or cyclic documents). **Locks:** `lock().unwrap_or_else(PoisonError::into_inner)` or an error; thread joins are `Result`s.
 - **Last-resort guard:** escaped panics during command execution and file import/export become an error, never a lost document. It's a safety net, not a licence.
 - **Prove it:** every crash fix lands with a small synthetic regression test that panicked before the fix.
-- Clean crates carry `#![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]`; new crates start with it. Tests may `unwrap` (`clippy.toml`).
+- Clean crates carry `#![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]`; new production crate roots must include the attribute before modules or other crate items, with crate-level `//!` documentation allowed before it. Every new workspace crate must also include `[lints] workspace = true` in `Cargo.toml` to inherit `[workspace.lints]`. Tests may `unwrap` (`clippy.toml`).
 
 ## Non-negotiables
 - **Clean-room.** InDesign is installed on the dev machine and may be *observed* black-box: run it, use its UI with synthetic documents, take screenshots (by window id) stored only under `plan/indesign/screenshots/` (never committed). Never read, disassemble or copy anything inside the InDesign bundle (names/listings only), never copy Adobe icons, artwork, presets or wording beyond feature names, never commit files produced by InDesign. Never copy GPL/AGPL/LGPL code (Scribus, LibreOffice, Ghostscript…).

Cargo.toml

@@ -107,9 +107,11 @@ 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"
 
 # Line tables keep file and line in panics and backtraces; full debug info

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 }