feat(sea): TypedValue codec converter for positional params

[msrathore-db]

Summary

• Add DBSQLParameter.toNapiTypedValue() and a top-level convertOrdinalParametersToTypedValueInputs() helper that translate the Node driver's user-facing { ordinalParameters: [...] } shape into the flat { sqlType, value: string | null } payload the SEA napi codec consumes.
• Stringification rules (boolean → `TRUE`/`FALSE`, Date → toISOString(), BigInt/Int64 → .toString(), integer-Number → INTEGER, non-integer Number → DOUBLE) are kept in exact lock-step with the Thrift emitter's toSparkParameter(). A regression-lock test pins the two emitters branch-by-branch, so a future refactor that diverges them breaks the test rather than silently breaking parity.

C5 cluster context

This is PR-B of the C5 (params-basic-binding) chain:

• PR-A (kernel napi codec): databricks-sql-kernel PR Columns with '.' in name break #84 — JS↔napi TypedValue codec.
• PR-B (this PR): Node-side converter from DBSQLParameter to napi's TypedValueInput.
• PR-C (driver-test): SEA-gated parity tests via BackendComparator.forEachBackend against databricks/databricks-driver-test.

Each PR is independent and can be reviewed in parallel — they only depend on each other for the end-to-end live-warehouse run.

Why a converter on main (and not full SEA wiring)

The SEA backend abstraction lives in feature branches (PR #378). main doesn't yet have a SeaBackend impl that would consume this codec, so this PR delivers the pure-TS load-bearing logic — the stringification path that bare JS values traverse on the way to the kernel. When the SEA backend abstraction lands on main, the wiring is a one-liner that calls convertOrdinalParametersToTypedValueInputs(options.ordinalParameters) and passes the result to the napi binding's Connection.executeStatement(sql, { positional_params }).

This shape lets the parity test land independently and lets each PR be reviewed for its own quality without one being blocked behind the others.

Quality gates

• `npm run lint` ✅ (no errors)
• `npm test tests/unit/DBSQLParameter.test.ts` — 13 passed (2 pre-existing + 11 new)
• `npx prettier --check` on changed files ✅
• DCO sign-off
• Conventional commit (`feat(sea): ...`)
• `Co-authored-by: Isaac` trailer

Test plan

• 11 new unit tests covering the 10-type C5 matrix (INT/BIGINT/FLOAT/DOUBLE/STRING/BOOLEAN/DATE/TIMESTAMP/DECIMAL/BINARY-N/A), explicit-type override, VOID/null short-circuits, and the Thrift-vs-napi alignment regression-lock.
• End-to-end live-warehouse run — covered by PR-C once PR-A lands and the SEA backend abstraction lands on `main`.

This pull request and its description were written by Isaac.