chore: add missing docs lint and document public API

Add `#![deny(missing_docs)]` across multiple crates and fill in
documentation for all public items, including struct fields, enum
variants, trait methods, and proc macros.  Also mark two shell scripts
as executable.

1 files changed, 2 insertions, 0 deletions

diff --git a/mingling/src/setups/repl_basic.rs b/mingling/src/setups/repl_basic.rs
index 71a38d2..cf04372 100644
--- a/mingling/src/setups/repl_basic.rs
+++ b/mingling/src/setups/repl_basic.rs
@@ -19,7 +19,9 @@ where
 /// meaning only the last configured instance will take effect globally.
 /// Do not configure multiple prompts with different values — only one will be used.
 pub enum BasicREPLPromptSetup {
+    /// A static prompt string that is displayed before each REPL input.
     Prompt(String),
+    /// A function that returns a dynamic prompt string each time the REPL reads input.
     Func(fn() -> String),
 }