Gate Playwright candidate readiness

[giaphutran12]

Summary

Stacked on #53 (codex/self-healing-process-trace).

This deliberately does not emit a Playwright script yet. A reviewer rejected the fake path: current process traces have search/fetch/source outcomes, but not browser selectors/actions. So this PR adds the honest gate before any compiler exists.

• Extends PopulateRuntimeTraceStep with a browser step kind and optional browserAction payload.
• Adds playwrightCandidateReadinessForRun.
• Persists a playwright-candidate-readiness artifact beside process-trace.
• Marks search/fetch-only traces as not_ready.
• Marks Agent-disabled browser/form/detail diagnostics as not_ready.
• Allows ready only when trace contains actionable browser steps plus source URLs.
• Keeps playwright-candidate-script reserved and un-emitted.

Why

The meeting shape was:

agent/search/fetch process -> documented process -> Playwright script -> cron

#53 made the documented process real. This PR makes the Playwright handoff honest: no script gets claimed until the trace has actual browser action truth.

Verification

• node --import ./backend/node_modules/tsx/dist/esm/index.mjs --test backend/test/populate-playwright-readiness.test.ts backend/test/populate-self-healing.test.ts
• npm --prefix backend run build
• npm --prefix backend test
• git diff --check
• node --check benchmarks/dataset-agent/run-benchmark.mjs
• make verify-self-healing

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