style: Apply cargo fmt and clippy fixes across codebase

Automated formatting and lint corrections from parallel agent work:

- cargo fmt: import reordering (alphabetical), line wrapping to respect
  max width, trailing comma normalization, destructuring alignment,
  function signature reformatting, match arm formatting
- clippy (pedantic): Range::contains() instead of manual comparisons,
  i64::from() instead of `as i64` casts, .clamp() instead of
  .max().min() chains, let-chain refactors (if-let with &&),
  #[allow(clippy::too_many_arguments)] and
  #[allow(clippy::field_reassign_with_default)] where warranted
- Removed trailing blank lines and extra whitespace

No behavioral changes. All existing tests pass unmodified.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/documents/mod.rs

@@ -7,11 +7,11 @@ mod regenerator;
 mod truncation;
 
 pub use extractor::{
-    compute_content_hash, compute_list_hash, extract_discussion_document,
-    extract_issue_document, extract_mr_document, DocumentData, SourceType,
+    DocumentData, SourceType, compute_content_hash, compute_list_hash, extract_discussion_document,
+    extract_issue_document, extract_mr_document,
 };
-pub use regenerator::{regenerate_dirty_documents, RegenerateResult};
+pub use regenerator::{RegenerateResult, regenerate_dirty_documents};
 pub use truncation::{
-    truncate_discussion, truncate_hard_cap, truncate_utf8, NoteContent, TruncationReason,
-    TruncationResult, MAX_DISCUSSION_BYTES, MAX_DOCUMENT_BYTES_HARD,
+    MAX_DISCUSSION_BYTES, MAX_DOCUMENT_BYTES_HARD, NoteContent, TruncationReason, TruncationResult,
+    truncate_discussion, truncate_hard_cap, truncate_utf8,
 };