fix(ci): remove recursive cargo fmt alias that broke CI

The alias `fmt = "fmt --all"` in .cargo/config.toml was recursive,
causing CI to fail with "unresolvable recursive definition" error.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: 2 people

.cargo/config.toml

@@ -9,5 +9,5 @@ t = "test"
 tr = "test --release"
 r = "run"
 rr = "run --release"
-fmt = "fmt --all"
+# Note: cargo fmt alias removed - was recursive and broke CI
 clippy = "clippy --all-targets --all-features"