openclaw - 💡(How to fix) Fix [Feature]: Channel Broker Phase 2A - broker conformance harness [3 pull requests]

Summary

Add the broker conformance harness required before moving major channels behind broker routing.

Problem to solve

Provider implementations need one shared test contract for inbound normalization, outbound final send, previews, receipts, retries, duplicate/redelivery handling, and /verbose behavior.

Proposed solution

Add conformance fixtures around the broker SDK and bundled channel-broker extension. The harness should exercise the broker contract without importing native channel extension internals.

Related context

• Umbrella: #86105
• Phase 2 tracker: #86108
• Phase 1 PR: #86096

Acceptance criteria

• Inbound normalization, ack policy, duplicate/redelivery, durable final send, receipt commit, retry, and unknown-send reconciliation are covered.
• Streaming modes include final-only, draft preview, progress preview, final edit, final fallback, stale preview cleanup, and /verbose tool-message behavior.
• Boundary tests assert core does not import platform extension internals.