lint: prepare manifests for cargo-rbmt lint

Author: KyrylR

Cargo.toml

@@ -10,6 +10,10 @@ edition = "2021"
 rust-version = "1.79.0"
 default-run = "simc"
 
+[package.metadata.rbmt.lint]
+# Existing transitive split: derive_arbitrary uses syn 1 while serde/wasm tooling uses syn 2.
+allowed_duplicates = ["syn"]
+
 [lib]
 name = "simplicityhl"
 path = "src/lib.rs"
@@ -82,7 +86,7 @@ copy_iterator = "warn"
 default_trait_access = "warn"
 doc_link_with_quotes = "warn"
 doc_markdown = "warn"
-empty_enums = "warn"
+empty_enum = "warn"
 enum_glob_use = "allow"
 expl_impl_clone_on_copy = "warn"
 explicit_deref_methods = "warn"
@@ -166,7 +170,7 @@ struct_field_names = "warn"
 too_many_lines = "allow"
 transmute_ptr_to_ptr = "warn"
 trivially_copy_pass_by_ref = "warn"
-unchecked_time_subtraction = "warn"
+unchecked_duration_subtraction = "warn"
 unicode_not_nfc = "warn"
 unnecessary_box_returns = "warn"
 unnecessary_join = "warn"

fuzz/Cargo.toml

@@ -8,6 +8,10 @@ rust-version = "1.79.0"
 [package.metadata]
 cargo-fuzz = true
 
+[package.metadata.rbmt.lint]
+# Existing transitive split: derive_arbitrary uses syn 1 while serde/wasm tooling uses syn 2.
+allowed_duplicates = ["syn"]
+
 [dependencies]
 libfuzzer-sys = "0.4"
 arbitrary = { version = "1", features = ["derive"] }