chore!: rename ErrorDispatcherNotFound to EntryFallback

Rename the internal fallback type and its associated `ProgramCollect`
plumbing from `ErrorDispatcherNotFound`/`build_dispatcher_not_found` to
`EntryFallback`/`build_entry_fallback`, along with the generated enum
variant and pack type. Update all documentation, examples, and tests
accordingly.

1 files changed, 20 insertions, 0 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index baa7f19..c954123 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -192,6 +192,26 @@ None
 
     _No behavioral changes — this is a pure feature rename. The `extras` feature provides identical functionality to the old `extra_macros` feature; all prelude and macros module re-exports remain the same under the new feature name._
 
+2. **[`core`]** **[BREAKING RENAME]** Renamed the internal fallback type `ErrorDispatcherNotFound` and its associated `ProgramCollect` plumbing to `EntryFallback` / `build_entry_fallback`.
+
+    **Associated type renames (on `ProgramCollect`):**
+
+    - `type ErrorDispatcherNotFound` → `type EntryFallback`
+    - `fn build_dispatcher_not_found(args)` → `fn build_entry_fallback(args)`
+
+    **Type/enum renames generated by `gen_program!()`:**
+
+    - Enum variant `ThisProgram::ErrorDispatcherNotFound` → `ThisProgram::EntryFallback`
+    - Pack type `ErrorDispatcherNotFound` → `EntryFallback` (created by `program_fallback_gen!()` via `pack!(EntryFallback = Vec<String>)`)
+
+    **Migration guide (for downstream code):**
+
+    - Renderer/help functions that previously took `ErrorDispatcherNotFound` as a parameter must now take `EntryFallback`.
+    - Any code referencing `C::build_dispatcher_not_found(...)` must now call `C::build_entry_fallback(...)`.
+    - Any manual `ProgramCollect` implementation (e.g., in tests or mocks) must rename both the associated type `ErrorDispatcherNotFound` → `EntryFallback` and the associated method `build_dispatcher_not_found` → `build_entry_fallback`.
+
+    _No behavioral changes — this is a pure rename of the internal fallback type and its associated `ProgramCollect` methods. The type's semantics, shape (wrapping `Vec<String>`), and rendering behavior are unchanged.
+
 ---
 
 ### Release 0.3.0 (2026-07-27)