refactor(core): improve code style and public API clarity

Replace bool-based settings with enums, refine visibility and
signatures, and standardize `Self` usage across the crate.

- Introduce `ErrorOutput`, `RenderOutput`, `PanicSilence`, `Verbosity`,
  `ColorOutput`, and `ProgressOutput` enums for clearer configuration
  semantics
- Make `GlobalResources`, `ProgramCell`, and
  `split_input`/`split_input_string` public
- Change hook info parameters to accept references and
  `split_input_string` to take `&str`
- Apply `Self` shorthand throughout implementations and add
  `#[must_use]` attributes where appropriate
- Enable strict clippy lints with targeted allowances

1 files changed, 1 insertions, 1 deletions

diff --git a/mingling_core/src/program/error.rs b/mingling_core/src/program/error.rs
index 144b5ab..0a5bfd0 100644
--- a/mingling_core/src/program/error.rs
+++ b/mingling_core/src/program/error.rs
@@ -21,7 +21,7 @@ impl fmt::Display for ProgramPanic {
 impl ProgramPanic {
     #[must_use]
     pub fn new(payload: Box<dyn Any + Send>) -> Self {
-        ProgramPanic { payload }
+        Self { payload }
     }
 }