Build the spawn:sweep-* + spawn:param:* tags for one sweep member. Emitted
only for sweep launches; wire-identical to the Go tool (pkg/aws/tags.go),
including the 35-parameter cap that keeps a member under AWS's 50-tag limit.
Parameter keys are emitted in sorted order so the (capped) subset is stable.
Build the spawn:sweep-* + spawn:param:* tags for one sweep member. Emitted only for sweep launches; wire-identical to the Go tool (pkg/aws/tags.go), including the 35-parameter cap that keeps a member under AWS's 50-tag limit. Parameter keys are emitted in sorted order so the (capped) subset is stable.