refactor: add debug Derive for struct

[Its-Just-Nans]

• The PR title must conform to Conventional Commits and start with one of the types specified by the Angular convention.

[amazon-q-developer]

This PR correctly adds Debug trait derivations to four internal structs in the magic finder module. The changes are purely additive and improve debuggability without affecting functionality. The PR title follows Conventional Commits format as required. The changes should compile correctly as all field types implement Debug. No blocking issues identified.

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[gemini-code-assist]

Code Review

This pull request adds #[derive(Debug)] to several structs in src/read/magic_finder.rs (Forward, Backwards, MagicFinder, and OptimisticMagicFinder) to improve debuggability. The reviewer points out that deriving Debug on MagicFinder will print its entire 1024-byte internal buffer, leading to overly verbose logs, and suggests implementing Debug manually to omit this field.

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[gemini-code-assist]

Deriving Debug on MagicFinder will print the entire 1024-byte buffer array, which makes debug logs extremely verbose and hard to read. It is better to implement Debug manually for MagicFinder to omit the buffer field or format it compactly.

impl<Direction: std::fmt::Debug> std::fmt::Debug for MagicFinder<Direction> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("MagicFinder")
            .field("finder", &self.finder)
            .field("cursor", &self.cursor)
            .field("mid_buffer_offset", &self.mid_buffer_offset)
            .field("bounds", &self.bounds)
            .finish_non_exhaustive()
    }
}

pub(crate) struct MagicFinder<Direction> {