wire decisions, tickets, markdown viewer, and graph extensions

Four stub extensions now contribute real tabs with views:

- Decisions panel (sidebar, priority -20): lists confirmed D-records
  from pql decisions list with ID, title, and domain.
- Tickets panel (sidebar, priority -10): lists tickets with status
  dot color-coded by state (done=green, in_progress=blue,
  cancelled=red).
- Markdown viewer (context, priority -100): shows raw content of
  the active .md file, listens for editor.buffer_activated events.
- Graph view (context, priority -80): lists files with inbound and
  outbound link counts from pql search --connections.

All four fetch data via the daemon's pql.exec IPC surface.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/lib/builtin/graph/src/extension.dart

@@ -1,17 +1,27 @@
+import 'package:clide_app/builtin/graph/src/graph_view.dart';
 import 'package:clide_app/extension/extension.dart';
+import 'package:clide_app/kernel/kernel.dart';
 
-/// Tier-0 stub. Real implementation lands in a later tier; the extension
-/// is registered so the extensions-ui surface can list it as "installed,
-/// not yet implemented" and its id is reserved.
 class GraphExtension extends ClideExtension {
   @override
   String get id => 'builtin.graph';
   @override
   String get title => 'Graph';
   @override
-  String get version => '0.0.0-stub';
+  String get version => '0.1.0';
   @override
   List<String> get dependsOn => const ['builtin.pql'];
+
   @override
-  List<ContributionPoint> get contributions => const [];
+  List<ContributionPoint> get contributions => [
+        TabContribution(
+          id: 'graph.view',
+          slot: Slots.contextPanel,
+          title: 'Graph',
+          titleKey: 'tab.graph',
+          i18nNamespace: id,
+          priority: -80,
+          build: (_) => const GraphView(),
+        ),
+      ];
 }

app/lib/builtin/graph/src/graph_view.dart

@@ -0,0 +1,122 @@
+import 'dart:async';
+import 'dart:convert';
+
+import 'package:clide_app/kernel/kernel.dart';
+import 'package:clide_app/widgets/widgets.dart';
+import 'package:flutter/widgets.dart';
+
+class GraphView extends StatefulWidget {
+  const GraphView({super.key});
+
+  @override
+  State<GraphView> createState() => _GraphViewState();
+}
+
+class _GraphViewState extends State<GraphView> {
+  List<_GraphNode> _nodes = [];
+  String? _error;
+  bool _loading = true;
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    if (!_loading || _nodes.isNotEmpty) return;
+    unawaited(_load());
+  }
+
+  Future<void> _load() async {
+    final kernel = ClideKernel.of(context);
+    final resp = await kernel.ipc.request('pql.exec', args: {
+      'argv': ['search', '--connections', '--limit', '50'],
+    });
+    if (!mounted) return;
+    if (!resp.ok) {
+      setState(() {
+        _error = resp.error?.message ?? 'failed to load graph';
+        _loading = false;
+      });
+      return;
+    }
+    final raw = resp.data['stdout'] as String? ?? '[]';
+    try {
+      final list = (jsonDecode(raw) as List).cast<Map<String, dynamic>>();
+      setState(() {
+        _nodes = list.map(_GraphNode.fromJson).toList();
+        _loading = false;
+      });
+    } catch (e) {
+      setState(() {
+        _error = 'parse error: $e';
+        _loading = false;
+      });
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final tokens = ClideTheme.of(context).surface;
+    if (_loading) {
+      return const Center(child: ClideText('Loading graph...', muted: true));
+    }
+    if (_error != null) {
+      return Padding(padding: const EdgeInsets.all(12), child: ClideText(_error!, muted: true));
+    }
+    if (_nodes.isEmpty) {
+      return const Padding(
+        padding: EdgeInsets.all(12),
+        child: ClideText('No linked files found.\nAdd wikilinks to your markdown files.', muted: true),
+      );
+    }
+    return ListView.builder(
+      itemCount: _nodes.length,
+      itemBuilder: (ctx, i) {
+        final n = _nodes[i];
+        return _NodeRow(node: n, tokens: tokens);
+      },
+    );
+  }
+}
+
+class _GraphNode {
+  const _GraphNode({required this.path, this.inbound = 0, this.outbound = 0});
+  final String path;
+  final int inbound;
+  final int outbound;
+
+  factory _GraphNode.fromJson(Map<String, dynamic> json) => _GraphNode(
+        path: json['path'] as String? ?? json['relative_path'] as String? ?? '',
+        inbound: (json['inbound_count'] as num?)?.toInt() ?? 0,
+        outbound: (json['outbound_count'] as num?)?.toInt() ?? 0,
+      );
+}
+
+class _NodeRow extends StatefulWidget {
+  const _NodeRow({required this.node, required this.tokens});
+  final _GraphNode node;
+  final SurfaceTokens tokens;
+
+  @override
+  State<_NodeRow> createState() => _NodeRowState();
+}
+
+class _NodeRowState extends State<_NodeRow> {
+  bool _hovered = false;
+
+  @override
+  Widget build(BuildContext context) {
+    return MouseRegion(
+      onEnter: (_) => setState(() => _hovered = true),
+      onExit: (_) => setState(() => _hovered = false),
+      child: Container(
+        color: _hovered ? widget.tokens.listItemHoverBackground : null,
+        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 4),
+        child: Row(
+          children: [
+            Expanded(child: ClideText(widget.node.path, fontSize: 13)),
+            ClideText('${widget.node.inbound}in ${widget.node.outbound}out', color: widget.tokens.globalTextMuted, fontSize: 11),
+          ],
+        ),
+      ),
+    );
+  }
+}