Enable virtual-mio/js feature for JS target

Add web-sys dependency to virtual-mio for the js feature, and enable
virtual-mio/js in wasmer-wasix's js feature set. This allows proper
debug tracing in the JS environment if needed.

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: NathanFlurry

lib/virtual-io/Cargo.toml

@@ -19,10 +19,11 @@ mio = { workspace = true, features = ["os-poll"], optional = true }
 socket2 = { workspace = true, optional = true }
 futures = { version = "0.3" }
 serde = { workspace = true, default-features = false, features = ["derive"] }
+web-sys = { version = "0.3.64", features = ["console"], optional = true }
 
 [dev-dependencies]
 mio = { workspace = true, features = ["os-poll", "os-ext"] }
 
 [features]
 sys = ["mio", "socket2"]
-js = []
+js = ["web-sys"]

lib/wasix/Cargo.toml

@@ -232,6 +232,7 @@ compiler = []
 
 js = [
 	"virtual-fs/js",
+	"virtual-mio/js",
 	"getrandom/js",
 	"chrono",
 	"js-sys",