claude[bot]2/11/2026, 9:10:23 PM

The previous fix incorrectly treated all null extraction results as zero,
which broke the test expecting unparseable data (like 'NaN') to fail.

Now we distinguish between:
- Empty structures (empty arrays, null, undefined) → treat as 0
- Unparseable data with content (invalid strings, NaN) → fail the check

This fixes the observability.slo.test.ts test while still addressing the
original P1 issue of empty log query results causing false SLO failures.

Co-authored-by: mweinbach <mweinbach@users.noreply.github.com>

Parent49191b7