Ingest collection browser action traces

[giaphutran12]

Summary

Stacked on #54 (codex/playwright-candidate-artifacts).

This wires the next honest Playwright precondition: if the collection runner or an Agent-enabled canary emits explicit browser actions, BigSet now preserves them in the process trace.

• Adds optional collection report fields: browser_actions and agent_browser_actions.
• Maps explicit action reports into PopulateRuntimeTraceStep { kind: "browser" }.
• Preserves fields mechanically:
  • target_text / targetText -> browserAction.targetText
  • value_description / valueDescription -> browserAction.valueDescription
  • status -> step.status
  • error -> step.error
  • phase -> step.input.phase
  • unknown actions -> browserAction.action = "unknown"
• Preserves order by appending browser_actions before agent_browser_actions in the same report scope.
• Does not infer selectors, clicks, or form inputs from URLs/source outcomes.

What this does not claim

• The current vendored collection pipeline is not claimed to emit these fields yet.
• No Playwright script is generated.
• No cron replay or script promotion is enabled.

Verification

• node --import ./backend/node_modules/tsx/dist/esm/index.mjs --test backend/test/collection-agent-runner.test.ts backend/test/populate-playwright-readiness.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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✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch codex/browser-action-trace-ingestion

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[giaphutran12]

Closing stale draft cleanup PR; superseded by later BigSet work.