lint: upgrade perfectionist to 0.0.0-rc.20

`0.0.0-rc.20` adds `separate_reexports` to `import_grouping_mismatch`
(KSXGitHub/perfectionist#325) and corrects `clap_help_markdown`'s false
positives on `ValueEnum` docs (KSXGitHub/perfectionist#326).

- `separate_reexports` (default `true`) keeps `pub use` re-exports in
  their own leading block natively, so the 11 per-file
  `#[expect(perfectionist::import_grouping_mismatch)]` suppressions are
  deleted and the integration tests' `pub use _utils::*` re-exports are
  separated from their private imports. Closes #442.
- The `clap_help_markdown` correction leaves a `ValueEnum`'s enum-level
  doc alone and recognises `#[cfg_attr(<cfg>, clap(help = ...))]`
  overrides, so the `BytesFormat` suppression is deleted. Closes #441.

https://claude.ai/code/session_016ZyYFnzSv876usUHLEX4qe

Author: claude

CONTRIBUTING.md

@@ -39,13 +39,15 @@ Automated tools enforce formatting (`cargo fmt`), linting (`cargo clippy`), and
 Two `perfectionist` rules govern imports automatically:
 
 - `perfectionist::import_granularity_mismatch`, configured for the `module` style, controls how items are merged within each `use` statement. Items from the same module are merged into a single braced `use` statement, while each module keeps its own `use` statement rather than collapsing an entire crate into one nested-braces statement.
-- `perfectionist::import_grouping_mismatch`, configured for the `single_block` style, controls how `use` statements are partitioned into blocks. Every `use` statement, whether a `pub use` re-export or a private import, sits in one contiguous block with no blank lines between them.
+- `perfectionist::import_grouping_mismatch`, configured for the `single_block` style, controls how `use` statements are partitioned into blocks. Private imports sit in one contiguous block with no blank lines between them, while `pub use` re-exports are pulled into their own leading block, separated by a blank line (the rule's default `separate_reexports = true`).
 
 Import ordering within the block is enforced separately by `cargo fmt`.
 
 Imports gated by a platform or feature attribute such as `#[cfg(unix)]` are kept in their own block after the main imports, separated by a blank line. Under `single_block` the rule recognizes this trailing `#[cfg]` block automatically through its default `cfg_block_handling = "trailing"`, so no manual exception is required.
 
 ```rust
+pub use sub::Sub;
+
 use crate::args::{Args, Quantity, Threads};
 use crate::bytes_format::BytesFormat;
 use crate::size;
@@ -62,7 +64,7 @@ use crate::get_size::{GetBlockCount, GetBlockSize};
 
 The flat file pattern (`module.rs` rather than `module/mod.rs`) is enforced by `clippy::mod_module_files`, enabled in `Cargo.toml`. Earlier releases relied on a `perfectionist::flat_module_pattern` rule; `perfectionist` `0.0.0-rc.19` removed it in favor of the equivalent Clippy lint. In addition to that requirement, follow these conventions:
 
-- List `pub mod` declarations first, followed by the `use` block, then the remaining items. The `use` block holds both `pub use` re-exports and private imports; `cargo fmt` and `perfectionist::import_grouping_mismatch` keep them in one sorted group, so do not rely on a fixed order between the two kinds.
+- List `pub mod` declarations first, then the `pub use` re-exports in their own group, then the private `use` block, then the remaining items. `perfectionist::import_grouping_mismatch` (`separate_reexports`) keeps the re-exports in a block of their own above the private imports, and `cargo fmt` sorts within each block.
 - Use `pub use` to re-export key types at the module level for convenience.
 
 ```rust

dylint.toml

@@ -1,6 +1,6 @@
 [workspace.metadata.dylint]
 libraries = [
-    { git = "https://github.com/KSXGitHub/perfectionist", tag = "0.0.0-rc.19" },
+    { git = "https://github.com/KSXGitHub/perfectionist", tag = "0.0.0-rc.20" },
 ]
 
 [perfectionist]

src/app.rs

@@ -1,11 +1,3 @@
-#![cfg_attr(
-    dylint_lib = "perfectionist",
-    expect(
-        perfectionist::import_grouping_mismatch,
-        reason = "pub use re-exports are kept in their own group; see #442"
-    )
-)]
-
 pub mod sub;
 
 pub use sub::Sub;

src/args.rs

@@ -1,11 +1,3 @@
-#![cfg_attr(
-    dylint_lib = "perfectionist",
-    expect(
-        perfectionist::import_grouping_mismatch,
-        reason = "pub use re-exports are kept in their own group; see #442"
-    )
-)]
-
 pub mod depth;
 pub mod fraction;
 pub mod quantity;

src/bytes_format.rs

@@ -1,11 +1,3 @@
-#![cfg_attr(
-    dylint_lib = "perfectionist",
-    expect(
-        perfectionist::import_grouping_mismatch,
-        reason = "pub use re-exports are kept in their own group; see #442"
-    )
-)]
-
 pub mod formatter;
 pub mod output;
 pub mod parsed_value;
@@ -23,13 +15,6 @@ use clap::ValueEnum;
 /// The [`DisplayFormat`](crate::size::Size::DisplayFormat) type of [`Bytes`](crate::size::Bytes).
 #[derive(Debug, Clone, Copy)]
 #[cfg_attr(feature = "cli", derive(ValueEnum))]
-#[cfg_attr(
-    dylint_lib = "perfectionist",
-    expect(
-        perfectionist::clap_help_markdown,
-        reason = "the enum-level doc is never used as --help text, and the variant docs are overridden by an explicit clap(help = ...); see issue #441"
-    )
-)]
 pub enum BytesFormat {
     /// Display the value as-is.
     #[cfg_attr(

src/data_tree.rs

@@ -1,11 +1,3 @@
-#![cfg_attr(
-    dylint_lib = "perfectionist",
-    expect(
-        perfectionist::import_grouping_mismatch,
-        reason = "pub use re-exports are kept in their own group; see #442"
-    )
-)]
-
 pub mod reflection;
 
 pub use Reflection as DataTreeReflection;

src/hardlink/hardlink_list.rs

@@ -1,11 +1,3 @@
-#![cfg_attr(
-    dylint_lib = "perfectionist",
-    expect(
-        perfectionist::import_grouping_mismatch,
-        reason = "pub use re-exports are kept in their own group; see #442"
-    )
-)]
-
 pub mod iter;
 pub mod reflection;
 pub mod summary;

src/hardlink/link_path_list.rs

@@ -1,11 +1,3 @@
-#![cfg_attr(
-    dylint_lib = "perfectionist",
-    expect(
-        perfectionist::import_grouping_mismatch,
-        reason = "pub use re-exports are kept in their own group; see #442"
-    )
-)]
-
 mod iter;
 mod reflection;
 

src/json_data.rs

@@ -1,11 +1,3 @@
-#![cfg_attr(
-    dylint_lib = "perfectionist",
-    expect(
-        perfectionist::import_grouping_mismatch,
-        reason = "pub use re-exports are kept in their own group; see #442"
-    )
-)]
-
 pub mod binary_version;
 pub mod schema_version;
 

src/reporter.rs

@@ -1,11 +1,3 @@
-#![cfg_attr(
-    dylint_lib = "perfectionist",
-    expect(
-        perfectionist::import_grouping_mismatch,
-        reason = "pub use re-exports are kept in their own group; see #442"
-    )
-)]
-
 pub mod error_only_reporter;
 pub mod error_report;
 pub mod event;