fix(codec): FLOP 子类型白名单，白名单外 STYP 落 Unsupported（ACM2-84）

- kindOf FLOP 分支仅放行现行七类（US-05 AC1），FDEL 独立分派不受影响
- 白名单外子类型（ACTT/CNCL 等 Q3 闭合目标）解码为 Unsupported，经 ACM2-83 路径记 SKIPPED、不改航班
- 补 codec 白名单回归与处理层「跳过且不触碰航班」用例

src/test/kotlin/com/gzzn/omms/msgexchange/codec/JacksonXmlCodecTest.kt

@@ -250,4 +250,25 @@ class JacksonXmlCodecTest {
         val unknown = (codec.decode(raw("XYZZ", "TEST")) as DecodeResult.Ok).message
         assertEquals(MsgKind.Unsupported("XYZZ-TEST"), unknown.kind)
     }
+
+    @Test
+    fun `FLOP subtype whitelist sends only the seven current types to FlopProcessor`() {
+        fun raw(styp: String) = """
+            <MSG><META><SNDR>AODB</SNDR><SEQN>9</SEQN><DTTM>20021010090311</DTTM>
+            <TYPE>FLOP</TYPE><STYP>$styp</STYP></META></MSG>
+        """.trimIndent()
+
+        // 现行白名单 7 类（US-05 AC1）
+        for (styp in listOf("ABTM", "DELY", "PSDT", "CKDT", "CLDT", "CHDT", "GTDT")) {
+            assertEquals(MsgKind.Flop(styp), (codec.decode(raw(styp)) as DecodeResult.Ok).message.kind)
+        }
+
+        // FDEL 独立分派，不参与白名单判定
+        assertEquals(MsgKind.Fdel, (codec.decode(raw("FDEL")) as DecodeResult.Ok).message.kind)
+
+        // 白名单外子类型（ACTT/CNCL 是 Q3 闭合目标）与空 STYP 都落 Unsupported，不走合并路径
+        assertEquals(MsgKind.Unsupported("FLOP-ACTT"), (codec.decode(raw("ACTT")) as DecodeResult.Ok).message.kind)
+        assertEquals(MsgKind.Unsupported("FLOP-CNCL"), (codec.decode(raw("CNCL")) as DecodeResult.Ok).message.kind)
+        assertEquals(MsgKind.Unsupported("FLOP-"), (codec.decode(raw("")) as DecodeResult.Ok).message.kind)
+    }
 }

src/test/kotlin/com/gzzn/omms/msgexchange/processing/IgnoreBranchTest.kt

@@ -24,6 +24,7 @@ import com.gzzn.omms.msgexchange.infra.stub.StubSnapshotLog
 import com.fasterxml.jackson.databind.ObjectMapper
 import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Assertions.assertNotNull
+import org.junit.jupiter.api.Assertions.assertTrue
 import org.junit.jupiter.api.Test
 import java.time.Clock
 import java.time.Instant
@@ -212,6 +213,28 @@ class IgnoreBranchTest {
         assertEquals("refdata-pending:ARPT", row.lastError)
     }
 
+    @Test
+    fun `flop subtype outside whitelist is skipped without touching flights`() {
+        val proc = StubProcState()
+        proc.insertIfAbsent(msgId, null)
+        val inbox = StubInbox()
+        inbox.raws[msgId] = "<RAW/>"
+        val msg = DecodedMessage(
+            meta = MetaFields("AODB", "FLOP", "ACTT", 500L, 1L),
+            kind = MsgKind.Unsupported("FLOP-ACTT"),
+            rawXml = "<RAW/>",
+        )
+        val flights = StubFlightState()
+        val p = processor(proc = proc, inbox = inbox, codec = codecReturning(msg))
+
+        p.processOne(head())
+
+        val row = proc.find(msgId)!!
+        assertEquals(ProcStatus.SKIPPED, row.state)
+        assertEquals("unsupported:FLOP-ACTT", row.lastError)
+        assertTrue(flights.snapshots.isEmpty())   // 白名单外子类型不改航班（US-05 AC1）
+    }
+
     @Test
     fun `ignore increments counter`() {
         val proc = StubProcState()