[magnusp]

Closes #35. Part of #54.

What changed

• LibsqlResultSetMetaData.getColumnType now checks the current row's runtime storage class before consulting the declared type, following xerial 3.53.4.0 JDBC3ResultSet.getColumnType (JDBC3ResultSet.java:622-721) branch by branch.
• Added the shared package-private read-only accessor LibsqlResultSet.valueForMetadata(int). It returns the value at the metadata cursor: the first row before the first next() (matching xerial's preloaded first row), the current row during iteration, and null at end-of-results so declared types apply.
• Added behavior tests for BIGINT holding 1.5, BOOLEAN holding 'true', NUMERIC and DECIMAL holding integers, NULL values, an empty result set, and type changes between rows.
• Removed the now-unused cross-row integerType and inferTypeFromValue helpers.

Contract decision

Runtime typing wins, matching xerial 3.53.4.0 and the #54 parity rule. getColumnType is gated on the current row's storage class, including NUMERIC/DECIMAL holding an integer reporting INTEGER. NULL or no current row falls back to declared-type mapping, which also covers empty result sets.

Evidence

Failing before the fix:

mise exec -- ./mvnw -pl libsql-jdbc -am -Dtest=LibsqlResultSetMetaDataTest -Dsurefire.failIfNoSpecifiedTests=false test
[ERROR] Tests run: 13, Failures: 2, Errors: 0, Skipped: 0
[ERROR] LibsqlResultSetMetaDataTest.usesRuntimeStorageClassForDeclaredTypes:164->assertRuntimeTypes:232
expected: 6
 but was: -5
[ERROR] LibsqlResultSetMetaDataTest.reflectsStorageClassChangesBetweenRows:219
expected: 6
 but was: -5

Passing after the fix:

mise exec -- ./mvnw -pl libsql-jdbc -am -Dtest=LibsqlResultSetMetaDataTest -Dsurefire.failIfNoSpecifiedTests=false test
Tests run: 13, Failures: 0, Errors: 0, Skipped: 0
BUILD SUCCESS

mise exec -- ./mvnw -pl libsql-jdbc -am test
Tests run: 65, Failures: 0, Errors: 0, Skipped: 0
BUILD SUCCESS

mise exec -- ./mvnw -pl libsql-conformance -am verify
Tests run: 106, Failures: 0, Errors: 0, Skipped: 1
BUILD SUCCESS

The conformance run includes the vendored xerial RSMetaDataTest against live sqld (13 tests, all passed). mise exec -- ./mvnw spotless:apply completed with no formatting changes.

Deviations

None.