Add EveFlutter provider picker proof

docs/eve-migration-roadmap.md

@@ -280,6 +280,13 @@ Exit criteria:
 
 Recently cut:
 
+- EveFlutter now has a provider-catalog picker primitive. `EveProviderCatalog`
+  parses conformance-export provider entries, including Sai/Norn/TeX plugin
+  requirements, and `EveProviderPicker` selects those provider ids without
+  reading web fixture paths. The Flutter smoke test proves provider selection
+  from an export-shaped provider list, so the split-readiness report records the
+  provider-picker proof as passed while leaving release/capture lifecycle
+  ownership as the remaining EveFlutter blocker.
 - EveFlutter now has a conformance consumer smoke at
   `scripts/run-eveflutter-conformance-consumer-smoke.ps1`. It runs from
   `flutter/eve_parity`, consumes the exported conformance pack, and asserts the

docs/parity-testing-harness.md

@@ -120,6 +120,11 @@ That script runs the export consumer from `flutter/eve_parity` and asserts the
 runtime pack, Sai provider fixture, Flutter runtime targets, and `EveFlutter`
 split target without reading `tools/parity/parity-manifest.json`.
 
+The Flutter widget smoke also exercises `EveProviderCatalog` and
+`EveProviderPicker` against a conformance-export-shaped provider list. That is
+the runtime-side provider picker proof; it consumes provider entries and plugin
+requirements without reading web fixture paths.
+
 Aetheria Unity package consumer smoke:
 
 ```powershell

docs/runtime-app-parity-roadmap.md

@@ -155,6 +155,9 @@ First cuts:
 - Scaffold a generic Eve Flutter app with the same provider picker as web.
 - Load the same local provider advertisements and local fixture surfaces during
   development.
+- Consume conformance-export provider entries through `EveProviderCatalog` and
+  select them through `EveProviderPicker`; this is the split-ready provider
+  picker input shape, distinct from web-local fallback fixture discovery.
 - Lower `surface.root` recursively into Flutter widgets/custom painters.
 - Lower CultUI partitions, `fieldRow`, labels, cards, buttons, metrics, and
   slider anatomy from `control.box`, `control.part`, and `control.hitArea`.

flutter/eve_parity/lib/main.dart

@@ -122,6 +122,126 @@ class EveSurfaceState {
   }
 }
 
+class EveProviderCatalog {
+  const EveProviderCatalog({required this.providers});
+
+  final List<EveProviderEntry> providers;
+
+  factory EveProviderCatalog.fromConformanceExport(Map<String, dynamic> json) {
+    final providers = ((json['providers'] as List<dynamic>?) ?? const [])
+        .map((provider) {
+          return EveProviderEntry.fromJson(provider as Map<String, dynamic>);
+        })
+        .toList(growable: false);
+    return EveProviderCatalog(providers: providers);
+  }
+
+  EveProviderEntry? findProvider(String providerId) {
+    for (final provider in providers) {
+      if (provider.providerId == providerId) return provider;
+    }
+    return null;
+  }
+}
+
+class EveProviderEntry {
+  const EveProviderEntry({
+    required this.providerId,
+    required this.status,
+    required this.ownerRepo,
+    required this.advertisementPath,
+    required this.surfaces,
+    required this.commands,
+    required this.pluginRequirements,
+  });
+
+  final String providerId;
+  final String status;
+  final String ownerRepo;
+  final String advertisementPath;
+  final List<String> surfaces;
+  final List<String> commands;
+  final List<EvePluginRequirement> pluginRequirements;
+
+  factory EveProviderEntry.fromJson(Map<String, dynamic> json) {
+    return EveProviderEntry(
+      providerId: (json['providerId'] ?? '').toString(),
+      status: (json['status'] ?? '').toString(),
+      ownerRepo: (json['ownerRepo'] ?? '').toString(),
+      advertisementPath: (json['advertisementPath'] ?? '').toString(),
+      surfaces: _stringList(json['surfaces']),
+      commands: _stringList(json['commands']),
+      pluginRequirements:
+          ((json['pluginRequirements'] as List<dynamic>?) ?? const [])
+              .map(
+                (requirement) => EvePluginRequirement.fromJson(
+                  requirement as Map<String, dynamic>,
+                ),
+              )
+              .toList(growable: false),
+    );
+  }
+}
+
+class EvePluginRequirement {
+  const EvePluginRequirement({
+    required this.surfaceId,
+    required this.pluginId,
+    required this.requiredCapabilities,
+  });
+
+  final String surfaceId;
+  final String pluginId;
+  final List<String> requiredCapabilities;
+
+  factory EvePluginRequirement.fromJson(Map<String, dynamic> json) {
+    return EvePluginRequirement(
+      surfaceId: (json['surfaceId'] ?? '').toString(),
+      pluginId: (json['pluginId'] ?? '').toString(),
+      requiredCapabilities: _stringList(json['requiredCapabilities']),
+    );
+  }
+}
+
+List<String> _stringList(Object? value) {
+  return ((value as List<dynamic>?) ?? const [])
+      .map((item) => item.toString())
+      .toList(growable: false);
+}
+
+class EveProviderPicker extends StatelessWidget {
+  const EveProviderPicker({
+    required this.catalog,
+    required this.selectedProviderId,
+    required this.onSelected,
+    super.key,
+  });
+
+  final EveProviderCatalog catalog;
+  final String selectedProviderId;
+  final ValueChanged<String> onSelected;
+
+  @override
+  Widget build(BuildContext context) {
+    return DropdownButton<String>(
+      value: catalog.findProvider(selectedProviderId) == null
+          ? null
+          : selectedProviderId,
+      hint: const Text('Select provider'),
+      items: [
+        for (final provider in catalog.providers)
+          DropdownMenuItem<String>(
+            value: provider.providerId,
+            child: Text(provider.providerId),
+          ),
+      ],
+      onChanged: (value) {
+        if (value != null) onSelected(value);
+      },
+    );
+  }
+}
+
 class EveNode {
   EveNode({
     required this.id,

flutter/eve_parity/test/parity_smoke_test.dart

@@ -122,6 +122,49 @@ void main() {
     expect(intents.single.clientId, 'flutter-parity');
     expect(intents.single.payload['action']['operation'], 'focus_entity');
   });
+
+  testWidgets('provider picker consumes conformance export providers', (
+    tester,
+  ) async {
+    final catalog = EveProviderCatalog.fromConformanceExport(
+      _providerCatalogExport,
+    );
+    var selected = 'aetheria';
+
+    await tester.pumpWidget(
+      MaterialApp(
+        home: StatefulBuilder(
+          builder: (context, setState) {
+            return EveProviderPicker(
+              catalog: catalog,
+              selectedProviderId: selected,
+              onSelected: (providerId) {
+                setState(() => selected = providerId);
+              },
+            );
+          },
+        ),
+      ),
+    );
+
+    expect(catalog.providers, hasLength(2));
+    expect(catalog.findProvider('gamecult.home.vn')?.ownerRepo, 'Sai');
+    expect(
+      catalog
+          .findProvider('gamecult.home.vn')
+          ?.pluginRequirements
+          .map((requirement) => requirement.pluginId),
+      containsAll(['sai.vn', 'norn.graph', 'tex.math']),
+    );
+    expect(find.text('aetheria'), findsOneWidget);
+
+    await tester.tap(find.byType(DropdownButton<String>));
+    await tester.pumpAndSettle();
+    await tester.tap(find.text('gamecult.home.vn').last);
+    await tester.pumpAndSettle();
+
+    expect(selected, 'gamecult.home.vn');
+  });
 }
 
 const fixtureId = String.fromEnvironment(
@@ -142,3 +185,48 @@ class _Viewport {
   final double width;
   final double height;
 }
+
+const _providerCatalogExport = {
+  'schema': 'gamecult.eve.conformance_export.v1',
+  'providers': [
+    {
+      'providerId': 'aetheria',
+      'status': 'advertised',
+      'ownerRepo': 'Aetheria',
+      'advertisementPath': 'web/fixtures/aetheria.provider-advertisement.json',
+      'surfaces': ['aetheria.daemon.game'],
+      'commands': ['aetheria.daemon.commands'],
+      'pluginRequirements': [],
+    },
+    {
+      'providerId': 'gamecult.home.vn',
+      'status': 'advertised',
+      'ownerRepo': 'Sai',
+      'advertisementPath': 'web/fixtures/sai-vn.provider-advertisement.json',
+      'surfaces': ['sai.visual_novel.surface'],
+      'commands': ['story.choose', 'story.continue', 'story.jump'],
+      'pluginRequirements': [
+        {
+          'surfaceId': 'sai.visual_novel.surface',
+          'pluginId': 'sai.vn',
+          'requiredCapabilities': [
+            'vn.stage',
+            'story.choose',
+            'story.continue',
+            'story.jump',
+          ],
+        },
+        {
+          'surfaceId': 'sai.visual_novel.surface',
+          'pluginId': 'norn.graph',
+          'requiredCapabilities': ['embed.norn'],
+        },
+        {
+          'surfaceId': 'sai.visual_novel.surface',
+          'pluginId': 'tex.math',
+          'requiredCapabilities': ['embed.tex'],
+        },
+      ],
+    },
+  ],
+};

tools/parity/parity-manifest.json

@@ -441,6 +441,15 @@
         }
       ],
       "proofs": [
+        {
+          "description": "Provider picker consumes provider advertisements without Eve source-layout knowledge.",
+          "status": "passed",
+          "evidencePaths": [
+            "flutter/eve_parity/lib/main.dart",
+            "flutter/eve_parity/test/parity_smoke_test.dart",
+            "tools/parity/run-parity.mjs"
+          ]
+        },
         {
           "description": "Conformance pack can be consumed without depending on Eve's local harness layout.",
           "status": "passed",
@@ -452,7 +461,6 @@
         }
       ],
       "pendingProofs": [
-        "Provider picker consumes provider advertisements without Eve source-layout knowledge.",
         "Flutter build, release, and capture lifecycle can run from EveFlutter."
       ]
     },
@@ -617,7 +625,7 @@
       "expectedSourceSymbols": [
         {
           "path": "flutter/eve_parity/lib/main.dart",
-          "contains": ["embeddedDocuments", "surface.slot", "EveEmbeddedDocumentSlot"]
+          "contains": ["embeddedDocuments", "surface.slot", "EveEmbeddedDocumentSlot", "EveProviderCatalog", "EveProviderPicker"]
         }
       ],
       "commandTransportSmoke": {
@@ -668,7 +676,7 @@
       "expectedSourceSymbols": [
         {
           "path": "flutter/eve_parity/lib/main.dart",
-          "contains": ["embeddedDocuments", "surface.slot", "EveEmbeddedDocumentSlot"]
+          "contains": ["embeddedDocuments", "surface.slot", "EveEmbeddedDocumentSlot", "EveProviderCatalog", "EveProviderPicker"]
         }
       ],
       "commandTransportSmoke": {
@@ -756,7 +764,7 @@
       "expectedSourceSymbols": [
         {
           "path": "flutter/eve_parity/lib/main.dart",
-          "contains": ["embeddedDocuments", "surface.slot", "EveEmbeddedDocumentSlot"]
+          "contains": ["embeddedDocuments", "surface.slot", "EveEmbeddedDocumentSlot", "EveProviderCatalog", "EveProviderPicker"]
         }
       ],
       "commandTransportSmoke": {