Function suggest_scope_fix 

pub fn suggest_scope_fix(
    message: &str,
    files: &[&str],
    valid_scopes: &[ScopeDefinition],
    issues: &[CommitIssue],
) -> Option<CommitSuggestion>

Deterministically suggests a corrected message for an unknown-scope or missing-scope issue.

Resolves a scope from files against valid_scopes via crate::git::commit::resolve_scope — no AI, no network. Returns None when there’s nothing to suggest: neither issue is present, the subject doesn’t parse, resolve_scope can’t resolve anything from files, or the resolved scope doesn’t actually change the message.

An existing-but-wrong scope (unknown-scope) is replaced via crate::git::commit::refine_message_scope. A missing scope (missing-scope, only reachable when rules.require_scope is set) is inserted between the type (and any breaking-change !) and the colon — refine_message_scope is deliberately not reused for this case, since its contract is “replace an existing scope,” never “add one.”