Experiment Runner smoke test

[ajonkisz]

Summary

• Documented the live Experiment Runner smoke test evidence, including pack activation, launch surfaces, A/B fan-out, treatment metadata propagation, route lifecycle, report generation, and autoresearch guardrails.
• Added non-optional browser E2E smoke coverage using a deterministic local fixture pack so launcher/deep-link/panel coverage runs even when the real pack is absent from the isolated test gateway.
• Verified the runner is ready for a small real Graphify A/B benchmark with caveats around realistic per-run budget and workflow choice.

Validation

• Implementation gate passed: build, typecheck, unit tests, E2E tests, gap/code/security/E2E reviews.
• Documentation gate passed.
• Manual live smoke evidence captured in docs/experiment-runner-smoke-test.md.

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