Function is_matching_backtracking 

pub fn is_matching_backtracking(
    topic: MStr<Topic>,
    pattern: MStr<Pattern>,
) -> bool

Match a topic against a pattern with wildcard support.

Wildcards:

• * matches zero or more characters
• ? matches exactly one character

Uses a greedy two-pointer algorithm. Chosen over DP (O(n*m) space), recursive backtracking (stack overflow risk), and regex (compilation overhead).