refactor!: replace build.rs with compile-time macro build steps

BREAKING CHANGE: Replace the `build`/`builds` feature system with
compile-time macro-driven generation. `gen_program!()` now automatically
invokes `build_comp!()` and `build_pathf!()` when the `comp`/`pathf`
features are enabled, eliminating the need for `build.rs` and
`[build-dependencies]` blocks.

This removes the `build` feature, the `mingling::build` module, and all
related build-time API functions. Completion scripts are now written to
`{target_directory}/mingling/` instead of `target/release/`. The
`mingling_cli` uses `build_comp!("mling")` for its custom binary name.

1 files changed, 5 insertions, 3 deletions

diff --git a/examples/example-combine-pathf-dispatch-tree/src/main.rs b/examples/example-combine-pathf-dispatch-tree/src/main.rs
index 75888ee..a93e7ae 100644
--- a/examples/example-combine-pathf-dispatch-tree/src/main.rs
+++ b/examples/example-combine-pathf-dispatch-tree/src/main.rs
@@ -4,11 +4,13 @@
 //! > Types are defined in a submodule (`sub`), and `gen_program!()` resolves
 //! > them automatically via pathf without explicit `use` imports.
 //! >
-//! > **Important**: `dispatch_tree` must be enabled in BOTH `[dependencies]`
-//! > AND `[build-dependencies]` so that pathf's builder can detect
-//! > `__internal_dispatcher_*` types needed by the dispatch tree.
+//! > **Important**: `dispatch_tree` must be enabled so that pathf's builder can
+//! > detect `__internal_dispatcher_*` types needed by the dispatch tree.
 //! >
 //! > Also requires `extras` for the implicit `dispatcher!("hello")` form.
+//! >
+//! > With the `pathf` feature, `gen_program!()` automatically invokes
+//! > `build_pathf!()` at compile time — no `build.rs` needed.
 //!
 //! Run:
 //! ```bash