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/embedding/mod.rs

@@ -4,6 +4,6 @@ pub mod chunking;
 pub mod ollama;
 pub mod pipeline;
 
-pub use change_detector::{count_pending_documents, find_pending_documents, PendingDocument};
-pub use chunking::{split_into_chunks, CHUNK_MAX_BYTES, CHUNK_OVERLAP_CHARS};
-pub use pipeline::{embed_documents, EmbedResult};
+pub use change_detector::{PendingDocument, count_pending_documents, find_pending_documents};
+pub use chunking::{CHUNK_MAX_BYTES, CHUNK_OVERLAP_CHARS, split_into_chunks};
+pub use pipeline::{EmbedResult, embed_documents};