Add Claude skill for fixing clippy issues

Author: guilload

.claude/skills/fix-clippy/SKILL.md

@@ -0,0 +1,26 @@
+---
+name: fix-clippy
+description: Fix all clippy lint warnings in the project
+---
+
+# Fix Clippy
+
+Clippy issues are **warnings**, not errors. Never grep for `error` when looking for clippy issues.
+
+## Step 1: Auto-fix
+
+Run `make fix` to automatically fix clippy warnings:
+
+```
+make fix
+```
+
+## Step 2: Fix remaining warnings manually
+
+Check for remaining warnings that couldn't be auto-fixed:
+
+```
+cargo clippy --tests 2>&1 | grep "^warning:" | sort -u
+```
+
+For each remaining warning, find the exact location and fix it manually.