Preserve Agent browser actions in reports

[giaphutran12]

Summary

Stacked on #55 (codex/browser-action-trace-ingestion).

This is the producer-side follow-up for browser-action traces. If TinyFish Agent result JSON includes explicit browser-action arrays, the vendored collection runner now preserves them in phase-scoped reports so #55 can ingest them into processTrace.steps.

• Adds BrowserActionReport schema.
• Preserves explicit browser_actions / agent_browser_actions from Agent results.
• Ignores generic actions arrays because they are not browser-specific enough for replay.
• Stores parsed actions on AgentRunRecord.browser_actions even when row extraction later yields zero rows or throws.
• Emits initial actions only at run_report.initial.agent_browser_actions.
• Emits repair actions only at repair.loops[*].agent_browser_actions.
• Does not emit top-level agent_browser_actions, avoiding double-counting in the Ingest collection browser action traces #55 consumer.

What this does not claim

• The TinyFish SDK does not currently type these payload fields.
• No browser actions are inferred from URLs, goals, source outcomes, or triage diagnostics.
• No Playwright script is generated.
• No cron replay or promotion is enabled.

Verification

• node --import ./backend/node_modules/tsx/dist/esm/index.mjs --test backend/test/collection-browser-actions.test.ts 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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[giaphutran12]

Closing stale draft cleanup PR; superseded by later BigSet work.