chore: adopt owner-scoped QPK research retirement

[Pigbibi]

Summary

• Forward the validated research_owner contract from the CN index ETF watcher to QuantPlatformKit's saved research cycle.
• Keep existing summary and cross-drift terminal-ticket reuse behavior, including durable ticket identity and no repeated optimizer/diagnosis calls.
• Pin the Cn repository's package, lockfile, compatibility check, and drift workflow to merged QPK 5488048cc0fc8e818b8c4be7a9729f6f1b5fdfdd.

Validation

• 54 passed across the affected CN research and strict-runner tests.
• The compatibility metadata test remains environment-blocked because ai_gateway_client is unavailable in the test interpreter; no dependency was added or upgraded.