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/decisions/src/decisions_view.dart

@@ -0,0 +1,128 @@
+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 DecisionsView extends StatefulWidget {
+  const DecisionsView({super.key});
+
+  @override
+  State<DecisionsView> createState() => _DecisionsViewState();
+}
+
+class _DecisionsViewState extends State<DecisionsView> {
+  List<_DecisionEntry> _decisions = [];
+  String? _error;
+  bool _loading = true;
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    if (!_loading || _decisions.isNotEmpty) return;
+    unawaited(_load());
+  }
+
+  Future<void> _load() async {
+    final kernel = ClideKernel.of(context);
+    final resp = await kernel.ipc.request('pql.exec', args: {
+      'argv': ['decisions', 'list', '--type', 'confirmed'],
+    });
+    if (!mounted) return;
+    if (!resp.ok) {
+      setState(() {
+        _error = resp.error?.message ?? 'failed to load decisions';
+        _loading = false;
+      });
+      return;
+    }
+    final raw = resp.data['stdout'] as String? ?? '[]';
+    try {
+      final list = (jsonDecode(raw) as List).cast<Map<String, dynamic>>();
+      setState(() {
+        _decisions = list.map(_DecisionEntry.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 decisions...', muted: true));
+    }
+    if (_error != null) {
+      return Padding(
+        padding: const EdgeInsets.all(12),
+        child: ClideText(_error!, muted: true),
+      );
+    }
+    if (_decisions.isEmpty) {
+      return const Padding(
+        padding: EdgeInsets.all(12),
+        child: ClideText('No decisions found.\nRun `pql decisions sync` to index.', muted: true),
+      );
+    }
+    return ListView.builder(
+        itemCount: _decisions.length,
+        itemBuilder: (ctx, i) {
+          final d = _decisions[i];
+          return _DecisionRow(entry: d, tokens: tokens);
+        },
+    );
+  }
+}
+
+class _DecisionEntry {
+  const _DecisionEntry({required this.id, required this.title, this.domain, this.status});
+  final String id;
+  final String title;
+  final String? domain;
+  final String? status;
+
+  factory _DecisionEntry.fromJson(Map<String, dynamic> json) => _DecisionEntry(
+        id: json['id'] as String? ?? '',
+        title: json['title'] as String? ?? '',
+        domain: json['domain'] as String?,
+        status: json['status'] as String?,
+      );
+}
+
+class _DecisionRow extends StatefulWidget {
+  const _DecisionRow({required this.entry, required this.tokens});
+  final _DecisionEntry entry;
+  final SurfaceTokens tokens;
+
+  @override
+  State<_DecisionRow> createState() => _DecisionRowState();
+}
+
+class _DecisionRowState extends State<_DecisionRow> {
+  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: [
+            ClideText(widget.entry.id, color: widget.tokens.globalTextMuted, fontSize: 12),
+            const SizedBox(width: 8),
+            Expanded(child: ClideText(widget.entry.title, fontSize: 13)),
+          ],
+        ),
+      ),
+    );
+  }
+}

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

@@ -1,17 +1,27 @@
+import 'package:clide_app/builtin/decisions/src/decisions_view.dart';
 import 'package:clide_app/extension/extension.dart';
+import 'package:clide_app/kernel/kernel.dart';
 
-/// Tier-reserved stub. Will surface a sidebar tab (filter by domain /
-/// status, backlinks from current file) + commands (`decisions.open`,
-/// `decisions.claim`, `decisions.amend`). Data source: `pql decisions …`.
 class DecisionsExtension extends ClideExtension {
   @override
   String get id => 'builtin.decisions';
   @override
   String get title => 'Decisions';
   @override
-  String get version => '0.0.0-stub';
+  String get version => '0.1.0';
   @override
   List<String> get dependsOn => const [];
+
   @override
-  List<ContributionPoint> get contributions => const [];
+  List<ContributionPoint> get contributions => [
+        TabContribution(
+          id: 'decisions.panel',
+          slot: Slots.sidebar,
+          title: 'Decisions',
+          titleKey: 'tab.title',
+          i18nNamespace: id,
+          priority: -20,
+          build: (_) => const DecisionsView(),
+        ),
+      ];
 }