feat(derive): scope component handler checks

Allow #[slhx::component("name")] to validate only the generated handles for that hemplate component, so component modules can be checked independently without implementing unrelated handles.

req: component/003

req: component/005

slhx-derive/tests/compile_fail.rs

@@ -56,6 +56,60 @@ mod todos {
     );
 }
 
+#[test]
+fn component_macro_can_validate_one_generated_component() {
+    // req: component/003 req: component/005 req: test/003
+    let fixture = Fixture::new("slhx-derive-component-scoped-pass");
+    fixture.write(
+        "Cargo.toml",
+        &format!(
+            r#"[package]
+name = "slhx-derive-component-scoped-pass"
+version = "0.0.0"
+edition = "2021"
+
+[lib]
+path = "src/lib.rs"
+
+[dependencies]
+slhx = {{ path = {:?} }}
+"#,
+            repo_path("slhx")
+        ),
+    );
+    fixture.write(
+        "build.rs",
+        r#"fn main() {
+    let out = std::path::PathBuf::from(std::env::var_os("OUT_DIR").unwrap());
+    std::fs::write(
+        out.join("slhx.syms"),
+        "slhx-syms-v1\nhandle\ttemplates/todos.heml::create\tcreate\t1\nhandle\ttemplates/admin.heml::delete\tdelete\t2\n",
+    )
+    .unwrap();
+}
+"#,
+    );
+    fixture.write(
+        "src/lib.rs",
+        r#"#[slhx::component("todos")]
+mod todos {
+    #[slhx::handler]
+    fn create() -> impl slhx::IntoEffect {
+        slhx::event("created", "")
+    }
+}
+"#,
+    );
+
+    let output = check_fixture(&fixture);
+
+    assert!(
+        output.status.success(),
+        "fixture failed to compile:\n{}",
+        String::from_utf8_lossy(&output.stderr)
+    );
+}
+
 #[test]
 fn handler_macro_reports_unknown_handle_and_bad_shape() {
     // req: derive_handler/001 req: test/003