fix: remove duplicate target specification causing rustc conflicts

Fix "Option 'target' given more than once" error by:

1. Remove manual --target specification from rustc_flags in
   rust_wasm_component.bzl. Rules_rust handles target selection
   automatically based on configured target triples in MODULE.bazel.

2. Remove problematic aliases in wasm_toolchain.bzl that were causing
   dependency cycles. Use *_binary targets directly instead.

The duplicate target specification was conflicting with clippy
configuration, causing CI build failures. Let rules_rust handle
cross-compilation to WASM targets properly through the platform
selection mechanism.

Author: avrabe

.claude/settings.local.json

@@ -0,0 +1,12 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(find:*)",
+      "Bash(bazel build:*)",
+      "Bash(bazel:*)",
+      "mcp__sequential-thinking__sequentialthinking",
+      "Bash(ls:*)"
+    ],
+    "deny": []
+  }
+}

MODULE.bazel.lock

@@ -165,9 +165,7 @@ def rust_wasm_component(
         # Build the Rust library as cdylib for this profile
         rust_library_name = "{}_wasm_lib_{}".format(name, profile)
 
-        profile_rustc_flags = rustc_flags + config["rustc_flags"] + [
-            "--target=" + WASM_TARGET_TRIPLE,
-        ]
+        profile_rustc_flags = rustc_flags + config["rustc_flags"]
 
         rust_library(
             name = rust_library_name,

rust/rust_wasm_component.bzl

@@ -263,24 +263,8 @@ alias(
     visibility = ["//visibility:public"],
 )
 
-# Aliases for backward compatibility
-alias(
-    name = "wasm-tools",
-    actual = ":wasm_tools_binary",
-    visibility = ["//visibility:public"],
-)
-
-alias(
-    name = "wac",
-    actual = ":wac_binary",
-    visibility = ["//visibility:public"],
-)
-
-alias(
-    name = "wit-bindgen",
-    actual = ":wit_bindgen_binary",
-    visibility = ["//visibility:public"],
-)
+# Note: Aliases removed to prevent dependency cycles
+# Use the _binary targets directly: wasm_tools_binary, wac_binary, wit_bindgen_binary
 """)
 
 wasm_toolchain_repository = repository_rule(