Run Node.js and Bun tests in parallel

Since builds are now completed by setup-mise before tests run,
there's no need to run tests in topological order. Adding --parallel
to pnpm run commands allows all package tests to execute concurrently,
reducing overall test execution time.

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

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

Author: moreal

mise.toml

@@ -106,12 +106,12 @@ run = "deno test --check --doc --allow-all --unstable-kv --trace-leaks --paralle
 [tasks."test:node"]
 description = "Run the test suite using Node.js"
 depends = ["prepare"]
-run = "pnpm run --recursive --filter '!{docs}' --config.enable-pre-post-scripts=false test"
+run = "pnpm run --recursive --parallel --filter '!{docs}' --config.enable-pre-post-scripts=false test"
 
 [tasks."test:bun"]
 description = "Run the test suite using Bun"
 depends = ["prepare"]
-run = "pnpm run --recursive --filter '!{docs}' --config.enable-pre-post-scripts=false test:bun"
+run = "pnpm run --recursive --parallel --filter '!{docs}' --config.enable-pre-post-scripts=false test:bun"
 
 [tasks.test]
 description = "Run the test suite across all environments (Deno, Node.js, Bun)"