feat: enable RUST_LOG=trace for all WAC binary invocations

- Added RUST_LOG=trace environment variable to wac_compose, wac_plug, and wac_remote_compose rules
- Enables detailed trace logging for debugging WAC composition issues
- Helps troubleshoot component loading, package resolution, and dependency issues
- Logging appears in Bazel build output when WAC operations are executed

This provides permanent trace-level visibility into WAC operations for easier debugging of composition failures.

Author: avrabe

wac/wac_compose.bzl

@@ -132,6 +132,8 @@ def _wac_compose_impl(ctx):
             # Disable network access to prevent registry lookups
             "NO_PROXY": "*",
             "no_proxy": "*",
+            # Enable trace logging for debugging WAC issues
+            "RUST_LOG": "trace",
         },
     )
 

wac/wac_plug.bzl

@@ -41,6 +41,10 @@ def _wac_plug_impl(ctx):
         outputs = [composed_wasm],
         mnemonic = "WacPlug",
         progress_message = "Plugging WASM components for %s" % ctx.label,
+        env = {
+            # Enable trace logging for debugging WAC issues
+            "RUST_LOG": "trace",
+        },
     )
 
     # Return provider

wac/wac_remote_compose.bzl

@@ -186,6 +186,8 @@ def _wac_remote_compose_impl(ctx):
             # Disable network access to prevent registry lookups during composition
             "NO_PROXY": "*",
             "no_proxy": "*",
+            # Enable trace logging for debugging WAC issues
+            "RUST_LOG": "trace",
         },
     )