Remove redundant lint entries from Cargo.toml (#8393)

30 lints in `[workspace.lints]` were set to `warn` despite already being
warn-by-default, or part of a lint group that is already enabled.

* `rust`: `elided_lifetimes_in_paths` and `unused_extern_crates` are in
`rust_2018_idioms`; `semicolon_in_expressions_from_macros` is in
`future_incompatible`; `unexpected_cfgs` and `unsafe_op_in_unsafe_fn`
are warn-by-default (the latter since edition 2024);
`rust_2021_prelude_collisions` never fires on edition 2021+.
* `rustdoc`: `broken_intra_doc_links` and `missing_crate_level_docs` are
in `rustdoc::all`.
* `clippy`: 22 lints that are in `clippy::all`.

The explicit `allow`s are kept, even though they are no-ops today, to
record our intent in case we ever enable `pedantic`.

No behavior change: `cargo clippy --all-features --all-targets` gives
the same output before and after.

* [x] I have followed the instructions in the PR template

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

Cargo.toml

@@ -164,16 +164,10 @@ winit = { version = "0.30.13", default-features = false }
 [workspace.lints.rust]
 unsafe_code = "deny"
 
-elided_lifetimes_in_paths = "warn"
 future_incompatible = { level = "warn", priority = -1 }
 nonstandard_style = { level = "warn", priority = -1 }
 rust_2018_idioms = { level = "warn", priority = -1 }
-rust_2021_prelude_collisions = "warn"
-semicolon_in_expressions_from_macros = "warn"
 trivial_numeric_casts = "warn"
-unexpected_cfgs = "warn"
-unsafe_op_in_unsafe_fn = "warn" # `unsafe_op_in_unsafe_fn` may become the default in future Rust versions: https://github.com/rust-lang/rust/issues/71668
-unused_extern_crates = "warn"
 unused_import_braces = "warn"
 unused_lifetimes = "warn"
 
@@ -182,8 +176,6 @@ unused_qualifications = "allow"
 
 [workspace.lints.rustdoc]
 all = "warn"
-missing_crate_level_docs = "warn"
-broken_intra_doc_links = "warn"
 
 # See also clippy.toml
 [workspace.lints.clippy]
@@ -191,10 +183,8 @@ all = { level = "warn", priority = -1 }
 
 allow_attributes = "warn"
 as_ptr_cast_mut = "warn"
-await_holding_lock = "warn"
 bool_to_int_with_if = "warn"
 branches_sharing_code = "warn"
-char_lit_as_u8 = "warn"
 checked_conversions = "warn"
 clear_with_drain = "warn"
 clone_on_ref_ptr = "warn"
@@ -205,11 +195,7 @@ debug_assert_with_mut_call = "warn"
 decimal_bitwise_operands = "warn"
 default_union_representation = "warn"
 derive_partial_eq_without_eq = "warn"
-disallowed_macros = "warn" # See clippy.toml
-disallowed_methods = "warn" # See clippy.toml
-disallowed_names = "warn" # See clippy.toml
 disallowed_script_idents = "warn" # See clippy.toml
-disallowed_types = "warn" # See clippy.toml
 doc_broken_link = "warn"
 doc_comment_double_space_linebreaks = "warn"
 doc_include_without_cfg = "warn"
@@ -219,7 +205,6 @@ duration_suboptimal_units = "warn"
 elidable_lifetime_names = "warn"
 empty_enum_variants_with_brackets = "warn"
 empty_enums = "warn"
-empty_line_after_outer_attr = "warn"
 enum_glob_use = "warn"
 equatable_if_let = "warn"
 exit = "warn"
@@ -236,11 +221,9 @@ fn_to_numeric_cast_any = "warn"
 format_push_string = "warn"
 from_iter_instead_of_collect = "warn"
 get_unwrap = "warn"
-if_let_mutex = "warn"
 ignore_without_reason = "warn"
 ignored_unit_patterns = "warn"
 implicit_clone = "warn"
-implied_bounds_in_impls = "warn"
 imprecise_flops = "warn"
 inconsistent_struct_constructor = "warn"
 index_refutable_slice = "warn"
@@ -262,23 +245,19 @@ large_include_file = "warn"
 large_stack_arrays = "warn"
 large_stack_frames = "warn"
 large_types_passed_by_value = "warn"
-let_unit_value = "warn"
 linkedlist = "warn"
 literal_string_with_formatting_args = "warn"
 lossy_float_literal = "warn"
 macro_use_imports = "warn"
 manual_assert = "warn"
-manual_clamp = "warn"
 manual_ilog2 = "warn"
 manual_instant_elapsed = "warn"
 manual_is_power_of_two = "warn"
 manual_is_variant_and = "warn"
 manual_let_else = "warn"
 manual_midpoint = "warn" # NOTE `midpoint` is often a lot slower for floats, so we have our own `emath::fast_midpoint` function.
-manual_ok_or = "warn"
 manual_string_new = "warn"
 map_err_ignore = "warn"
-map_flatten = "warn"
 match_bool = "warn"
 match_same_arms = "warn"
 match_wild_err_arm = "warn"
@@ -286,14 +265,10 @@ match_wildcard_for_single_variants = "warn"
 mem_forget = "warn"
 mismatching_type_param_order = "warn"
 missing_assert_message = "warn"
-missing_enforced_import_renames = "warn"
 missing_errors_doc = "warn"
 missing_fields_in_debug = "warn"
-missing_safety_doc = "warn"
-mixed_attributes_style = "warn"
 mut_mut = "warn"
 mutex_integer = "warn"
-needless_borrow = "warn"
 needless_continue = "warn"
 needless_for_each = "warn"
 needless_pass_by_ref_mut = "warn"
@@ -304,7 +279,6 @@ negative_feature_names = "warn"
 non_std_lazy_statics = "warn"
 non_zero_suggestions = "warn"
 nonstandard_macro_braces = "warn"
-only_used_in_recursion = "warn"
 option_as_ref_cloned = "warn"
 option_option = "warn"
 or_fun_call = "warn"
@@ -318,7 +292,6 @@ ptr_cast_constness = "warn"
 pub_underscore_fields = "warn"
 pub_without_shorthand = "warn"
 rc_mutex = "warn"
-readonly_write_lock = "warn"
 redundant_type_annotations = "warn"
 ref_as_ptr = "warn"
 ref_option = "warn"
@@ -340,11 +313,9 @@ string_add = "warn"
 string_add_assign = "warn"
 string_lit_as_bytes = "warn"
 string_lit_chars_any = "warn"
-suspicious_command_arg_space = "warn"
 suspicious_xor_used_as_pow = "warn"
 todo = "warn"
 too_long_first_doc_paragraph = "warn"
-too_many_arguments = "warn"
 trailing_empty_array = "warn"
 trait_duplication_in_bounds = "warn"
 transmute_ptr_to_ptr = "warn"
@@ -373,13 +344,14 @@ unused_trait_names = "warn"
 unwrap_used = "warn"
 use_self = "warn"
 useless_let_if_seq = "warn"
-useless_transmute = "warn"
 verbose_file_reads = "warn"
 wildcard_dependencies = "warn"
 zero_sized_map_values = "warn"
 
 
 # TODO(emilk): maybe enable more of these lints?
+# NOTE: these are all in `pedantic`/`restriction`/`nursery`, so the `allow` is a no-op today.
+# We keep them to record our intent in case we ever enable those groups.
 cast_possible_wrap = "allow"
 comparison_chain = "allow"
 should_panic_without_expect = "allow"