feat(core)!: replace RenderResult with buffered output model

Remove `Deref<Target=str>` and `render_text:String` in favor of
`render_buffer:Vec<(String, RenderResultMode)>` and an
`immediate_output`
flag. Add `RenderResultMode` enum, `r_eprint!`/`r_eprintln!` macros, and
new buffer manipulation methods (`append_to_buffer`, `eprint`, etc.).
Update `Display` to trim output and remove trailing newline. Migrate all
callers and tests away from `Deref` usage.

1 files changed, 1 insertions, 1 deletions

diff --git a/mingling_core/tests/test-dispatch-tree/tests/integration.rs b/mingling_core/tests/test-dispatch-tree/tests/integration.rs
index 7cd7b8c..e51992c 100644
--- a/mingling_core/tests/test-dispatch-tree/tests/integration.rs
+++ b/mingling_core/tests/test-dispatch-tree/tests/integration.rs
@@ -60,7 +60,7 @@ fn test_render_result_default() {
 fn test_render_result_print() {
     let mut r = RenderResult::default();
     r.print("hello");
-    assert_eq!(&*r, "hello");
+    assert_eq!(r.to_string().as_str(), "hello");
 }
 
 #[test]