Bind the db.* driver over the same transport as the capability stubs so
deps.Pool keeps working for plugin sqlc code:
- dispatch.go: g.services.Pool = bnwasm.NewPool(capTransport) (nil on
native/DESCRIBE → fails cleanly, matching the caps stubs).
- hostcalls.go (wasip1): also bind the "bnwasm" database/sql driver's
process-global transport to CallHost.
- docs/wasm-abi.md: document the implemented guest driver + pgx-primary
rationale under the Pool disposition.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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