Refresh planner priorities after retry hardening

[asim]

Summary:

• Remove the completed broad provider resilience item after Harden retry cancellation during backoff #4702 merged.
• Promote first-agent docs command verification as the top developer-adoption item.
• Keep the AtlasCloud plan/delegate recovery issue in the queue as the next provider-operability gap.

Testing:

• go build ./...
• go test ./... (fails in this environment: loopback targets forbidden in grpc tests; AtlasCloud stream returned 400)
• golangci-lint run ./... (fails: linter built with Go 1.24, target is Go 1.25.12)

Closes #4703

[Copilot]

Pull request overview

Updates the autonomous improvement loop’s ranked work queue to reflect the completion of the broad provider resilience effort (via #4702) and to re-focus the next iteration work on developer adoption and the next concrete provider-operability gap.

Changes:

• Removes the completed “Harden agent provider failure resilience” queue item after #4702.
• Promotes “Verify first-agent docs commands in CI” to the top priority with refreshed scope/guardrails.
• Adds/keeps “Harden AtlasCloud plan-delegate tool-call recovery” as the next provider-operability item.

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