style(clippy): replace match-with-return-None with ? in common.rs

[github-actions]

What clippy found

error: this `match` expression can be replaced with `?`
  --> src/compile/common.rs:1733:9
   |
   |         match current.parent() {
   |             Some(parent) => current = parent.to_path_buf(),
   |             None => return None,
   |         }
   |
   = help: for further information visit (rustlang.github.io/redacted)

How it was fixed

Lint: clippy::question_mark
Fix: replaced the match/return None pattern with let parent = current.parent()? — the idiomatic Rust early-return form.
File touched: src/compile/common.rs

Verification

• cargo build --all-targets ✅
• cargo test ✅ (all tests pass)
• cargo clippy --all-targets --all-features --workspace -- -D warnings ✅ (zero warnings/errors)

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