fix(fixtures): restore process() on scoped/multi secret demo fixtures

The scope/type-aware ResolvedSecrets refactor (4351f33) left the
process() method that emits {scope, found, secret_keys} attached to
MultiSecretDemoFunction instead of ScopedSecretDemoFunction. As a result
ScopedSecretDemoFunction had no process() (abstract-instantiation
TypeError) and MultiSecretDemoFunction's process() read state.found /
state.secret_keys, which MultiSecretDemoState does not define
(AttributeError).

Give ScopedSecretDemoFunction its process() back, and give
MultiSecretDemoFunction a correct one that emits api_key from
MultiSecretDemoState. Fixes secret_scoped.test and secret_multi_scope.test.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: rustyconover

vgi/_test_fixtures/table/settings.py

@@ -412,6 +412,25 @@ def initial_state(cls, params: ProcessParams[ScopedSecretDemoArgs]) -> ScopedSec
             secret_keys=",".join(secret.keys()) if secret else "",
         )
 
+    @classmethod
+    def process(
+        cls,
+        params: ProcessParams[ScopedSecretDemoArgs],
+        state: ScopedSecretDemoState,
+        out: OutputCollector,
+    ) -> None:
+        """Emit scope info and resolved secret keys."""
+        batch = pa.RecordBatch.from_pydict(
+            {
+                "scope": [params.args.path],
+                "found": [state.found],
+                "secret_keys": [state.secret_keys],
+            },
+            schema=params.output_schema,
+        )
+        out.emit(batch)
+        out.finish()
+
 
 @dataclass(kw_only=True)
 class MultiSecretDemoState(ArrowSerializableDataclass):
@@ -456,16 +475,12 @@ def initial_state(cls, params: ProcessParams[ScopedSecretDemoArgs]) -> MultiSecr
     def process(
         cls,
         params: ProcessParams[ScopedSecretDemoArgs],
-        state: ScopedSecretDemoState,
+        state: MultiSecretDemoState,
         out: OutputCollector,
     ) -> None:
-        """Emit scope info and resolved secret keys."""
+        """Emit the resolved api_key for the path-matched secret."""
         batch = pa.RecordBatch.from_pydict(
-            {
-                "scope": [params.args.path],
-                "found": [state.found],
-                "secret_keys": [state.secret_keys],
-            },
+            {"api_key": [state.api_key]},
             schema=params.output_schema,
         )
         out.emit(batch)