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, 0 deletions

diff --git a/mingling_core/src/comp/comp_ctx.rs b/mingling_core/src/comp/comp_ctx.rs
index 8d7fa5c..6384909 100644
--- a/mingling_core/src/comp/comp_ctx.rs
+++ b/mingling_core/src/comp/comp_ctx.rs
@@ -10,6 +10,7 @@ where
     /// (defined by [`COMPLETION_SUBCOMMAND`]) appears among the parsed arguments.
     /// When `true`, the program should generate shell completions instead of
     /// running its normal execution path.
+    #[must_use]
     pub fn is_completing(&self) -> bool {
         // Check if the first argument (args[1]) is the completion subcommand
         self.args