docs: refresh planner priorities for 4053

[asim]

Summary:

• Drop completed Lead CLI docs wayfinding with micro agent demo #4046 from the ranked work queue after Lead CLI docs with agent demo #4049 shipped the CLI docs wayfinding.
• Add Lead getting-started with the no-secret first-run path #4054 as the next adoption-focused priority to align Getting Started with the no-secret first-run and first-agent path.

Testing:

• go build ./...
• go test ./... (fails in this environment: loopback targets forbidden in grpc loopback tests)
• golangci-lint run ./...

Closes #4053