Add tracing instrumentation for prover stages#53
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Emit `tracing` spans for each major STARK proving stage in `System::prove_multiple_claims`: stage 1 commit, lookup construction, stage 2 commit, quotient, and FRI opening. Lookup trace construction itself is broken into `lookup_messages`, `batch_inverse`, and `lookup_traces` sub-spans. The whole call is wrapped in `stark/prove` via `#[tracing::instrument]`. No subscriber is installed here — downstream consumers wire up a subscriber (e.g. `tracing-texray`) to consume the spans.
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Add tracing instrumentation for profiling proof generation. If there is no subscriber initialized then the overhead is negligible, but applications can add subscribers like tracing-texray to collect and display the output.