refactor!: rename slhx to hemx

Rename the tracked product identity, crate/package names, Rust paths/macros, generated artifacts, runtime files, public attributes, examples, docs, requirements, and tests from slhx to hemx without compatibility shims.

Verified with cargo run -p hemx-xtask -- test, cargo test -p hemx-derive --test compile_fail, cargo test -p hemx-js, cargo test -p hemx-axum, cargo test -p hemx-v0-examples, cargo check --workspace, redgate list, redgate refs, redgate health --strict, git diff --check, and git grep/ls-files legacy-name audits.

req: misc/001

req: codegen/001

req: component/004

req: runtime/001

examples/kanban/src/lib.rs

@@ -1,4 +1,4 @@
-#[slhx::surface]
+#[hemx::surface]
 pub mod ui {}
 
 #[cfg(test)]
@@ -6,8 +6,8 @@ mod tests {
     use super::ui::{board, board_card};
     use hemplate::Hemplate;
     use scraper::{Html, Selector};
-    use slhx::IntoEffect;
-    use slhx_test::inspect;
+    use hemx::IntoEffect;
+    use hemx_test::inspect;
 
     #[derive(Hemplate)]
     #[hemplate = "partials"]
@@ -17,7 +17,7 @@ mod tests {
 
     #[allow(dead_code)]
     #[derive(Clone, Debug)]
-    #[slhx::form("create_card")]
+    #[hemx::form("create_card")]
     struct CreateCard {
         title: String,
         column: String,
@@ -56,8 +56,8 @@ mod tests {
     // req: examples/001 req: form/001 req: form/004 req: form/006 req: derive_handler/003
     #[test]
     fn kanban_form_handler_is_checked_against_hemplate_form() {
-        #[slhx::handler]
-        fn create_card(_form: slhx::Form<CreateCard>) -> impl IntoEffect {
+        #[hemx::handler]
+        fn create_card(_form: hemx::Form<CreateCard>) -> impl IntoEffect {
             board::notice.text("queued")
         }