fix: update wizer init function to wizer-initialize (wasmtime v39+)

Breaking change aligned with wasmtime wizer migration:
- Update rust_wasm_component_wizer default from "wizer.initialize" to "wizer-initialize"
- Update checksum_updater_wasm to use new export name
- Mark checksum_updater_wasm_wizer as manual (experimental)
  - Component model wizer integration requires WIT-level exports
  - Core module #[export_name] doesn't work with component exports

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: avrabe

MODULE.bazel.lock

@@ -15,7 +15,7 @@ def rust_wasm_component_wizer(
         visibility = None,
         crate_root = None,
         edition = "2021",
-        init_function_name = "wizer.initialize",
+        init_function_name = "wizer-initialize",
         **kwargs):
     """Builds a Rust WebAssembly component with Wizer pre-initialization.
 
@@ -31,7 +31,7 @@ def rust_wasm_component_wizer(
         visibility: Target visibility
         crate_root: Rust crate root file
         edition: Rust edition (default: "2021")
-        init_function_name: Wizer initialization function name (default: "wizer.initialize")
+        init_function_name: Wizer initialization function name (default: "wizer-initialize")
         **kwargs: Additional arguments passed to rust_library
     """
 

rust/private/rust_wasm_component_wizer.bzl

@@ -61,15 +61,20 @@ alias(
     actual = ":checksum_updater_wasm_component",
 )
 
+# Note: Wizer pre-initialization with WebAssembly components requires the init
+# function to be exported via WIT interface, not just #[export_name]. This target
+# is experimental until proper component model integration is implemented.
+# Tagged manual to exclude from `bazel build //...`
 rust_wasm_component_wizer(
     name = "checksum_updater_wasm_wizer",
     srcs = ["src/main.rs"],
     crate_features = [
         "default",
         "wizer",
     ],
-    init_function_name = "wizer_initialize",
+    init_function_name = "wizer-initialize",
     profiles = ["release"],
+    tags = ["manual"],  # Excluded from default builds - experimental
     deps = [
         "@crates//:anyhow",
         "@crates//:chrono",

tools/checksum_updater_wasm/BUILD.bazel

@@ -904,8 +904,8 @@ fn get_tool_info(tool: &str) -> Result<ToolRuleInfo> {
 }
 
 /// Wizer initialization function
-#[no_mangle]
-pub fn wizer_initialize() {
+#[export_name = "wizer-initialize"]
+pub extern "C" fn wizer_initialize() {
     // Pre-load the registry for faster startup
     if let Ok(manager) = ChecksumManager::new() {
         if let Ok(tools) = manager.discover_tools() {