Fix custom tool transpilation and bundling

[cte]

Important

Enhances custom tool transpilation and bundling using esbuild-wasm, with new functions, tests, and dependency updates.

• Behavior:
  • Adds copyEsbuildWasmFiles() in esbuild.ts to copy esbuild-wasm files for cross-platform transpilation.
  • Updates copyWasms() in esbuild.ts to include esbuild-wasm files.
  • Replaces esbuild with esbuild-wasm in custom-tool-registry.ts for tool transpilation.
  • Sets extension path in extension.ts for finding bundled esbuild-wasm.
• Dependencies:
  • Adds esbuild-wasm and execa to package.json in packages/core.
  • Removes esbuild from dependencies in src/package.json.
• Testing:
  • Adds esbuild-runner.spec.ts to test getEsbuildScriptPath() and runEsbuild() functions.
• Misc:
  • Adds esbuild-runner.ts to handle esbuild-wasm CLI execution.

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[roomote]

Rooviewer   See task on Roo Cloud

All issues resolved. This commit consolidates esbuild-wasm copying into the copyWasms function and removes the now-unnecessary separate export. No new issues found.

• Remove unused __dirname variable in test file

Previous reviews

• efcec28: Review #1
• 8e0adc0: Review #2
• 7e05c57: Review #3
• 482cead: Review #4

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