Extend an existing rental's expires_at by N billing periods. Pay-on-success: USDC settles only after the extension is actually in place, normally within a minute. Stack cap periods ∈ [1, 12]; price is the original (sku, region) rate × periods, and a probe without ?token= is quoted a sample at the entry rate. Same-box, same-IP — no mid-rental failover. Returns {status: 'renewing', predicted_expires_at} until settle completes; original expires_at remains in force until then.

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