Refresh planner queue for 4695

[asim]

Summary:

• Remove the completed Nack redelivery priority after Fix memory stream Nack ordering #4694 merged.
• Keep provider failure resilience as the top open queue item.
• Add the first-agent docs command CI verification issue to balance developer adoption with hardening.

Testing:

• go build ./...
• go test ./... (fails in this environment due loopback restrictions and atlascloud stream response)
• golangci-lint run ./... (fails because installed linter was built with Go 1.24 while repo targets Go 1.25.12)

Closes #4695

[Copilot]

Pull request overview

Updates the autonomous loop’s ranked work queue to reflect the completion of the Nack redelivery work (via #4694) and to reprioritize upcoming reliability/DX work tracked in open issues.

Changes:

• Removes the completed “Fix in-memory stream Nack redelivery ordering” queue item.
• Promotes “Harden agent provider failure resilience” (#4650) to the top queue item and updates its progress context.
• Adds “Verify first-agent docs commands in CI” (#4696) as a new queue item to protect the documented developer on-ramp.

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