Refresh planner priorities for 4675

[asim]

Summary:

• Remove the closed AtlasCloud plan/delegate persistence item from the loop priority queue.
• Promote scheduled cross-provider conformance as the top active item, followed by provider failure resilience.

Testing:

• go build ./...
• go test ./... (fails in existing environment/provider tests: ai AtlasCloud stream returned 400 not found; client/grpc loopback targets forbidden)
• golangci-lint run ./... (fails because installed golangci-lint was built with Go 1.24 while repo targets Go 1.25.12)

Closes #4675

[Copilot]

Pull request overview

Updates the autonomous loop’s ranked work queue to reflect that the AtlasCloud plan/delegate persistence work is complete, and reorders the remaining active priorities in line with the roadmap direction.

Changes:

• Removed the closed AtlasCloud plan/delegate persistence queue item.
• Promoted scheduled cross-provider agent conformance to the top priority.
• Kept provider failure resilience as the next priority item.

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