feat: enhance strictness of Rust compiler settings and improve code quality by treating warnings as errors

.cargo/config.toml

@@ -0,0 +1,48 @@
+# Strict Rust compiler configuration for zesdex
+# Forces all warnings as errors, enables maximum optimization for release builds.
+
+[target.'cfg(all())']
+# Treat all warnings as errors — zero tolerance policy
+rustflags = [
+    # Force all lints to error level (stricter than -Dwarnings)
+    "-W", "unused",
+    "-W", "dead_code",
+    "-W", "unreachable_code",
+    "-W", "unused_imports",
+    "-W", "unused_variables",
+    "-W", "unused_mut",
+    "-W", "unused_must_use",
+    "-W", "unused_unsafe",
+    "-W", "unused_extern_crates",
+
+    # Safety-critical
+    "-W", "trivial_casts",
+    "-W", "trivial_numeric_casts",
+
+    # Deprecation and future compat
+    "-W", "deprecated",
+    "-W", "deprecated_in_future",
+    "-W", "keyword_idents",
+    "-W", "noop_method_call",
+
+    # Type system
+    "-W", "invalid_type_param_default",
+    "-W", "unused_labels",
+    "-W", "while_true",
+]
+
+[profile.release]
+# Maximum speed optimizations for release builds
+opt-level = 3
+debug = false
+debug-assertions = false
+overflow-checks = true
+lto = "fat"
+codegen-units = 1
+panic = "abort"
+strip = "symbols"
+
+[profile.dev]
+# Keep dev fast but still strict
+opt-level = 0
+debug = true