[dajiaohuang]

Change

When max_passages cuts off a document after keeping one or more of its passages, chunks increments omitted_documents but did not include that document in the set used to classify omitted_documents_are. This could report oldest even though the cut document is both kept and omitted. Include the cut document in the omitted set and add a regression test for the reported coverage.

Also use ? for the existing optional Go import parse branch so strict Clippy passes for graphicle-memory.

Validation

• cargo fmt --check
• cargo test --locked --all-targets in crates/graphicle-memory
• cargo clippy --locked --all-targets -- -D warnings in crates/graphicle-memory
• git diff --check