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/renderer/structural/error.rs b/mingling_core/src/renderer/structural/error.rs
index 63ded81..2787dff 100644
--- a/mingling_core/src/renderer/structural/error.rs
+++ b/mingling_core/src/renderer/structural/error.rs
@@ -11,7 +11,7 @@ pub struct StructuralRendererSerializeError {
 impl StructuralRendererSerializeError {
     /// Creates a new `StructuralRendererSerializeError` with the given error message.
     #[must_use]
-    pub fn new(error: String) -> Self {
+    pub const fn new(error: String) -> Self {
         Self { error }
     }
 }