v0.2.5: Zero-row structured response, total/returned_count output fields

Zero-row structured response, total/returned_count output fields

eia_query_route now returns structured empty data on zero-row results instead of throwing, and surfaces total/returned_count in every response.

Fixed:

• Zero-row results from eia_query_route now return { data: [], total: 0, returned_count: 0, notice: '...' } instead of throwing -32001 NotFound (#20)
• no_data error reason narrowed to inverted-date-range path only
• Service-layer notFound() throw now includes recovery.hint, consistent with handler path (#22)

Added:

• total and returned_count required output fields on eia_query_route
• notice optional field present on zero-row results with filter-adjustment guidance

169 tests pass; bun run devcheck clean.