Replay browser runtime tool calls

[chubes4]

Summary

• Expose browser sandbox tools as canonical runtime tool declarations so Agents API/Data Machine can mediate client/filesystem-write calls.
• Capture safe browser provider diagnostics for request/response tool-call replay metadata.
• Harden browser recipe PHP execution against Playground client request-shape differences.

Tests

• node --check packages/wordpress-plugin/assets/browser-runtime.js
• php tests/smoke-wordpress-plugin.php

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: Diagnosed live Studio Web browser-generation failures, drafted the browser-runtime and generated-runner changes, and ran local smoke verification; Chris remains responsible for review and final acceptance.