Cut 4 Soul 4c: committed-unlogged wire writes, database serves only what it owns, typed unowned refusal

Q1: HandlePutAsync/HandleDeleteAsync catch a CultNetShardLogException (or an
AggregateException holding one) before the generic catch and answer nothing: the
write committed and was published, so the peer is not told it was refused. It is
logged at warning level. The wire has no committed-with-degraded-log message.
Q2: GetAsync/GetAll/GetByName/GetByIndex, the shard-less snapshot, the selection
and the subscription snapshot serve only rows a shard owns, so read and watch
agree; the CultMesh collections follow through GetAll, and the Mesh untyped
variant fallback checks ownership. The raw cache still holds everything.
Q3: a replica log apply skips a row its shard does not own, as the snapshot path
does, and still records the entry so a chained replica sees no gap.
API: rowFilter is internal (public CreateSelectionResponse and
CreateRawSnapshotResponse signatures restored, internal overloads added);
exception tags on the write methods; Commit's unwrap rule is XML doc; the
unowned refusal answers on the wire with code unowned_schema (schema enum in both
copies, Rust CultNetErrorCode, CultNetErrorMessage.ForUnownedSchema) and put and
delete log it at warning level.
Dispose keeps journal-first; a test now fails if the observer goes first.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/GameCult.Networking/CultNetDatabaseSubscriptionServer.cs

@@ -421,7 +421,8 @@ namespace GameCult.Networking
                 documentSelection,
                 ordinalOf: (schemaId, key) => _database.LastWriteSequence(schemaId, key) ?? 0,
                 asOf: _database.CurrentAsOf(),
-                options: null);
+                options: null,
+                rowFilter: _database.Owns);
             // The snapshot is one row per record key by construction, so the duplicate-key throw this
             // used to guard can no longer fire (docs/cultnet-selection-cut.md, S2-2); deleted rather
             // than tested around.