feat(core): rename `builds` feature to `build`

Replace the `builds` feature with `build` across the crate, keeping
a backward-compatible alias for the old name.  Update all internal
visibility from `#[doc(hidden)] pub mod` to `pub(crate) mod` and
reorganize the `__private` module into a dedicated `private.rs`.

1 files changed, 1 insertions, 1 deletions

diff --git a/mingling_core/Cargo.toml b/mingling_core/Cargo.toml
index 14140c6..f525609 100644
--- a/mingling_core/Cargo.toml
+++ b/mingling_core/Cargo.toml
@@ -14,7 +14,7 @@ categories = ["command-line-interface"]
 nightly = []
 default = []
 async = []
-builds = []
+build = []
 picker = []
 
 dispatch_tree = []