decision detail shows full markdown body via pql decisions read

New pql.decisions.read IPC verb returns the full markdown section
body. Decision detail view now shows: title card, full decision
text (rationale, cost, cross-references), and clickable ref cards
for cross-reference navigation.

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

lib/src/daemon/pql_commands.dart

@@ -125,6 +125,19 @@ void registerPqlCommands(DaemonDispatcher d, PqlClient pql) {
     }
   });
 
+  d.register('pql.decisions.read', (req) async {
+    final id = req.args['id'] as String?;
+    if (id == null || id.isEmpty) {
+      return _userError(req.id, 'pql.decisions.read requires an id');
+    }
+    try {
+      final result = await pql.decisionRead(id);
+      return IpcResponse.ok(id: req.id, data: result);
+    } on PqlException catch (e) {
+      return _pqlError(req.id, e);
+    }
+  });
+
   d.register('pql.decisions.show', (req) async {
     final id = req.args['id'] as String?;
     if (id == null || id.isEmpty) {

lib/src/pql/client.dart

@@ -94,6 +94,10 @@ class PqlClient {
     return _runObject(args);
   }
 
+  Future<Map<String, Object?>> decisionRead(String id) async {
+    return _runObject(['decisions', 'read', id]);
+  }
+
   Future<List<Map<String, Object?>>> decisionCoverage() async {
     return _runList(['decisions', 'coverage']);
   }