Avoid recursive SQLite row decoder check hang

[lukewilliamboswell]

Summary

Avoid Roc issue roc-lang/roc#11621 in the SQLite row decoder. The recursive local function combined ? propagation with inferred result types, which makes the September 23 compiler spin during roc check even for a hello-world app importing this platform.

Use explicit result matches in the recursive row collector. Use the same form in the two unannotated query wrappers, where the compiler otherwise reports error-row type mismatches after the hang is removed. The success and error paths are unchanged.

Validation

With Roc nightly-2026-09-23-c7852fd and a local platform reference:

• Before: roc check examples/hello-world-local.roc --no-cache exceeded a 20-second timeout.
• After: hello-world, sqlite-basic, and sqlite-everything each pass roc check --no-cache in about 0.1 seconds.
• The same three sources pass roc test --no-cache (213 tests).
• roc fmt --check platform/Sqlite.roc passes.

The local-reference files were temporary copies and are not included in this PR. CI remains pinned to the September 22 compiler; this PR does not publish a basic-cli release or change downstream release URLs.