feat: complete remaining jetstream parity implementation plan

docs/plans/2026-02-23-jetstream-remaining-parity-verification.md

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+# JetStream Remaining Parity Verification (2026-02-23)
+
+## Targeted Gate
+
+Command:
+
+```bash
+dotnet test tests/NATS.Server.Tests --filter "FullyQualifiedName~JetStream|FullyQualifiedName~Raft|FullyQualifiedName~Route|FullyQualifiedName~Gateway|FullyQualifiedName~Leaf" -v minimal
+```
+
+Result:
+
+- Passed: `54`
+- Failed: `0`
+- Skipped: `0`
+- Duration: `~10s`
+
+## Full Suite Gate
+
+Command:
+
+```bash
+dotnet test -v minimal
+```
+
+Result:
+
+- Passed: `737`
+- Failed: `0`
+- Skipped: `0`
+- Duration: `~1m 5s`
+
+## Focused Scenario Evidence
+
+- `JetStreamApiProtocolIntegrationTests.Js_api_request_over_pub_reply_returns_response_message`
+- `JetStreamStreamMessageApiTests.Stream_msg_get_delete_and_purge_change_state`
+- `JetStreamDirectGetApiTests.Direct_get_returns_message_without_stream_info_wrapper`
+- `JetStreamSnapshotRestoreApiTests.Snapshot_then_restore_reconstructs_messages`
+- `JetStreamConsumerNextApiTests.Consumer_msg_next_respects_batch_request`
+- `JetStreamPushConsumerContractTests.Ack_all_advances_floor_and_clears_pending_before_sequence`
+- `RaftSafetyContractTests.Follower_rejects_stale_term_vote_and_append`
+- `JetStreamClusterControlApiTests.Stream_leader_stepdown_and_meta_stepdown_endpoints_return_success_shape`
+- `JetStreamMonitoringParityTests.Jsz_and_varz_include_expanded_runtime_fields`
+- `JetStreamIntegrationMatrixTests.Integration_matrix_executes_real_server_scenarios`