refactor(clippy): collapse if and drop redundant closure in compile/mod.rs

[github-actions]

What clippy found

error: this `if` statement can be collapsed
   --> src/compile/mod.rs:269:5
   |
269 | /     if sync_gitattributes {
270 | |         if let Err(e) = sync_gitattributes_for_output(&yaml_output_path).await {
271 | |             debug!("Skipped .gitattributes update: {}", e);
272 | |         }
273 | |     }

error: redundant closure
   --> src/compile/mod.rs:493:19
   |
493 |         .find_map(|line| crate::detect::parse_header_line(line))
   |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: replace the closure with the function itself: `crate::detect::parse_header_line`

How it was fixed

• clippy::collapsible_if (line 269): merged the nested if sync_gitattributes { if let Err(e) = ... } into a single if sync_gitattributes && let Err(e) = ... chain (valid in Rust 2024 edition).
• clippy::redundant_closure (line 493): replaced |line| crate::detect::parse_header_line(line) with crate::detect::parse_header_line directly.

Only src/compile/mod.rs was touched.

Verification

• cargo build --all-targets ✅
• cargo test ✅ (all tests pass)
• cargo clippy --all-targets --all-features --workspace -- -D warnings ✅ (no warnings in compile/mod.rs)

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