Virtualized results grid over streaming ResultSet

Own work item — the single biggest chunk of the port (bubbles/table is far weaker than tview.Table). Lazy cell production, batched row streaming from the driver, "rows X-Y of ~N, elapsed" status. Adds the streaming/paged fetch half of ResultSet deferred from v1.0.

**Acceptance (parity gate):** 100k-row result scrolls smoothly; benchmarked rows/sec + peak RSS (/usr/bin/time -l) + idle CPU ~0 recorded in the repo; no full materialization on unbounded queries.

Start by locating the existing ResultSet and table implementation referenced by the issue, including the current tview.Table integration and driver row-fetch path. Benchmark the resulting 100k-row scroll with /usr/bin/time -l and record rows/sec, peak RSS, and idle CPU; done means smooth scrolling without full materialization for unbounded queries.

Written by the indexing model from the issue text.