Addresses the review question on whether reusing runner across the go generate and go build steps in Handle() is safe.

Findings

• runner is identical to r.process — Process.Env() mutates the receiver and returns r, not a clone
• Both Run() calls are strictly sequential; Run() blocks until the subprocess exits
• The Process contract documents "should not be reused concurrently" — sequential reuse is the intended pattern
• WithSpinner() is called before each Run(), and loading/loadingMessage are copied by value into the Running instance inside start(), so later mutations to the process state cannot affect an in-flight execution
• Env vars (CGO_ENABLED, GOOS, GOARCH) are intentionally shared between both commands via the single runner

No code changes required — the implementation is correct as-is.

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