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.

2 files changed, 13 insertions, 70 deletions

diff --git a/docs/pages/advanced/1-completion.md b/docs/pages/advanced/1-completion.md
index 20bd59e..ca1f621 100644
--- a/docs/pages/advanced/1-completion.md
+++ b/docs/pages/advanced/1-completion.md
@@ -11,13 +11,6 @@ Mingling's completion is **fully dynamic** — no static completion files, sugge
 # Cargo.toml
 [dependencies.mingling]
 features = ["comp"]
- 
-[build-dependencies.mingling]
-features = [
-    "comp",
-    # Enable `build` for build-time support
-    "build"
-]
 ```
  
 ## How it works
@@ -72,8 +65,18 @@ suggest! {
 
 ## Generate completion scripts
 
-Call `build_comp_scripts` in `build.rs` to generate completion scripts (requires `builds` + `comp` features).
+When the `comp` feature is enabled, `gen_program!()` automatically invokes `build_comp!()` at compile time, which generates the completion scripts (named after `CARGO_PKG_NAME`) into `target/mingling/`.
+
+If your binary name differs from the crate name, call `build_comp!()` manually with the binary name:
 
+```rust
+// Features: ["comp"]
+@@@use mingling::macros::build_comp;
+@@@fn example() {
+build_comp!("mybin");
+@@@}
+```
+ 
 See [example-completion](https://mingling-rs.github.io/mingling/docs/example-viewer.html?name=example-completion).
 
 <p align="center" style="font-size: 0.85em; color: gray;">
diff --git a/docs/pages/other/features.md b/docs/pages/other/features.md
index b2c0ea5..858e556 100644
--- a/docs/pages/other/features.md
+++ b/docs/pages/other/features.md
@@ -25,42 +25,6 @@ Mingling provides a set of **preset feature groups** that make it easy to enable
 
 **Positioning:** Full mode, enables all of Mingling's core functionality. In addition to `advanced`, it includes clap integration, the full structural renderer (with all serialization formats), and the experimental path analyzer. Suitable for large, feature-complete command-line applications.
 
-## `build_advanced`
-
-**Enables features:** `build`, `comp`
-
-**Positioning:** Build-time enhanced configuration, used to generate build helpers such as completion scripts at build time (the `comp` feature provides completion script generation).
-
-> [!NOTE]
->
-> This feature group is intended for **build dependencies** only and must be used alongside the `advanced` feature. Enable it in the `[build-dependencies]` section of `Cargo.toml`:
-
-```toml
-[dependencies.mingling]
-features = ["advanced"]
- 
-[build-dependencies.mingling]
-features = ["build_advanced"]
-```
- 
-## `build_full`
-
-**Enables features:** `build`, `comp`, `pathf`, `dispatch_tree`
-
-**Positioning:** Full build-time configuration, extends `build_advanced` with the path analyzer (`pathf`) to automatically resolve type module paths, suitable for projects with complex structures that require automated build-time analysis.
-
-> [!NOTE]
->
-> This feature group is intended for **build dependencies** only and must be used alongside the `full` feature. Enable it in the `[build-dependencies]` section of `Cargo.toml`:
-
-```toml
-[dependencies.mingling]
-features = ["full"]
- 
-[build-dependencies.mingling]
-features = ["build_full"]
-```
- 
 # Feature Details
 
 ## Feature `all_serde_fmt`
@@ -91,23 +55,6 @@ async fn handle_state_foo(foo: StateFoo) -> Next {
  
 See [example](https://mingling-rs.github.io/mingling/docs/example-viewer.html?name=example-async-support)
 
-## Feature `builds`
-
-**Description:**
-
-Enables scripts needed for use in `build.rs`, currently including:
-
-1. Completion script generation under the `comp` feature:
-
-```rust
-// BUILD TIME
-// Features: ["builds", "comp"]
-use mingling::build::build_comp_scripts;
- 
-// Generate completion scripts for `myprogram`
-build_comp_scripts("myprogram").unwrap();
-```
- 
 ## Feature `clap`
 
 **Description:**
@@ -318,17 +265,10 @@ When enabled, types can be defined in any submodule, and `gen_program!()` can au
 # Cargo.toml
 [dependencies.mingling]
 features = ["pathf"]
- 
-[build-dependencies.mingling]
-features = ["builds", "pathf"]
-```
- 
-```rust
-// BUILD TIME
-// Features: ["pathf"]
-analyze_and_build_type_mapping().unwrap();
 ```
  
+With the `pathf` feature enabled, `gen_program!()` automatically invokes `build_pathf!()` at compile time to run the type mapping analysis.
+
 See [example](https://mingling-rs.github.io/mingling/docs/example-viewer.html?name=example-pathfinder)
 
 ## Feature `picker`