feat(framework): --browser gives the agent a real browser (chrome-devtools-mcp)#466
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Phase 1 of #452: give the agent a real browser during a run, host side only, no runner change.
Adds
--browser. When set, the build driver writes a temp--mcp-configwiringchrome-devtools-mcp(a maintained stdio server that launches its own Chromium). The agent can then navigate pages, read console + network output, inspect the DOM, and screenshot while it works, instead of only type-checking and guessing whether a frontend change works.Notes:
npx -y chrome-devtools-mcp@latestresolves it on demand, nothing to pre-install.--strict-mcp-config).ClaudeCodeDrivergains anmcpServersoption backing this; the temp config is written once per session and removed on dispose.Phase 2 (bundling Chromium into the sandbox runner image) stays gated on the agent-in-container move, tracked in #452.
Closes #452