feat!(node): stage machine validity proofs - #283
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Implements the Sling node side of #282.
The node now captures and persists the Cartesi Machine proofs for
iflags.Y,htif.tohost, and the TX buffer, validates them against the final machine state, and submits them when staging a tournament result.It also replaces SQLite migration machinery with a create-only schema identified by the node version and raw schema fingerprint. Tests cover real accepted, rejected, and non-yielded machines.