tests(v2): Add Cloud Search API integration parity matrix

[oss-amikos]

Context\nCloud parity should include search behavior validation (not just collection query basics).\n\n## Scope\nAdd live cloud integration tests for:\n- pagination\n- IDIn/IDNotIn filters\n- document contains/not_contains filters\n- metadata projection/selection\n- combined filter scenarios\n\n## Acceptance Criteria\n- Deterministic cloud integration suite for search parity runs in CI/manual gate.\n- Failures clearly indicate API/behavior regressions.\n\nRelated: #94