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, 4 insertions, 4 deletions

diff --git a/mingling_core/src/program.rs b/mingling_core/src/program.rs
index 11e1bbf..3c43cee 100644
--- a/mingling_core/src/program.rs
+++ b/mingling_core/src/program.rs
@@ -109,7 +109,7 @@ where
 
     /// Creates a new Program instance with the provided command-line arguments.
     pub fn new_with_args(args: impl Into<StringVec>) -> Self {
-        Program {
+        Self {
             collect: std::marker::PhantomData,
             args: args.into().into(),
 
@@ -133,14 +133,14 @@ where
     /// # Panics
     ///
     /// Panics if the program has not been initialized yet.
-    pub fn this_program() -> &'static Program<C>
+    pub fn this_program() -> &'static Self
     where
         C: 'static,
     {
         THIS_PROGRAM
             .get_raw()
             .unwrap()
-            .downcast_ref::<Program<C>>()
+            .downcast_ref::<Self>()
             .unwrap()
     }
 
@@ -173,7 +173,7 @@ where
     /// # Returns
     ///
     /// The previous command-line arguments.
-    pub fn replace_args(&mut self, args: Vec<String>) -> Vec<String> {
+    pub const fn replace_args(&mut self, args: Vec<String>) -> Vec<String> {
         std::mem::replace(&mut self.args, args)
     }