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, 2 insertions, 1 deletions

diff --git a/mingling_core/src/program/single_instance.rs b/mingling_core/src/program/single_instance.rs
index 8b165bf..083897d 100644
--- a/mingling_core/src/program/single_instance.rs
+++ b/mingling_core/src/program/single_instance.rs
@@ -13,7 +13,7 @@ use crate::{Program, ProgramCollect};
 ///   the inner value is immutable once set until `take()`).
 /// - `take()` is called only after execution completes, when no code still
 ///   holds a reference from `get_raw()`.
-pub(crate) struct ProgramCell {
+pub struct ProgramCell {
     initialized: AtomicBool,
     inner: UnsafeCell<Option<Box<dyn std::any::Any + Send + Sync>>>,
 }
@@ -88,6 +88,7 @@ impl ProgramCell {
 }
 
 /// Global static reference to the current program instance
+#[allow(clippy::redundant_pub_crate)]
 pub(crate) static THIS_PROGRAM: ProgramCell = ProgramCell::new();
 
 /// Returns a reference to the current program instance, panics if not set.