Function compute_confidence 

pub fn compute_confidence(
    total_defs: usize,
    library_exports: usize,
    framework_dispatched: usize,
    main_entries: usize,
    test_entries: usize,
    ffi_entries: usize,
) -> DeadCodeConfidence

Compute a DeadCodeConfidence level from entry-point kind counts.

Parameters mirror the counts emitted by crate::entry_points::summarize_entry_point_kinds:

• total_defs — total number of definitions in the graph.
• library_exports — count of crate::entry_points::EntryPointKind::LibraryExport entries.
• framework_dispatched — count of crate::entry_points::EntryPointKind::FrameworkDispatched entries.
• main_entries — count of crate::entry_points::EntryPointKind::Main entries.
• test_entries — count of crate::entry_points::EntryPointKind::Test entries.
• ffi_entries — count of crate::entry_points::EntryPointKind::Ffi entries.

ProcMacro / Init / BuildScript entries are not passed separately; they are rare enough that their absence does not materially affect the heuristic.