Per-event documentation + getPluginEvents introspection (#71)

* Add per-event documentation + getPluginEvents introspection

Mirror the per-method documentation pipeline for events. Events
(declared in a universal module's logos_events: section) now carry a
description parsed from their /// doc comments, and are introspectable
at runtime via a new getPluginEvents framework call.

- lidl_ast: EventDecl gains a description field.
- impl_header_parser: capture the event's doc comment (previously
  discarded) and an optional metadata.json events[].description.
- lidl_gen_provider: generated universal provider emits
  getEvents() override, mirroring getMethods() (name/signature/
  parameters/description; no returnType/isInvokable — events are void).
- logos_provider_object: default-empty virtual getEvents() so the
  legacy provider path and QtProviderObject inherit empty.
- module_proxy / qt_provider_object: intercept getPluginEvents next to
  the getPluginMethods special-case.
- docs: spec + README event-documentation notes.

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

* Add unit tests for event documentation + getEvents generation

Address review feedback (#71): cover the event-introspection paths that
previously only had method-side tests.

- impl_header_parser test: assert metadata.json events[].description is
  parsed; new documented_events fixture asserts `///` doc-comment
  capture on a logos_events: block (multi-line joined with \n,
  adjacent-only, plain // ignored).
- lidl_gen_provider test: assert the generated dispatch contains
  getEvents() emitting each event's name/signature/parameters and an
  escaped description, and that events carry no returnType/isInvokable.

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

* Fold event introspection into getMethods() to keep the provider ABI stable

The previous approach added a getEvents() virtual to LogosProviderObject,
which inserted a new vtable slot and shifted every later slot — an ABI
break that would misdispatch virtual calls whenever an old and new
host/module were mixed across the in-process plugin boundary.

Instead, report events INSIDE the existing getMethods() call: it now
returns the module's whole interface, with each entry tagged
type "method" or "event" (events omit returnType/isInvokable). The
provider vtable is therefore byte-for-byte unchanged, so old/new hosts
and modules stay binary-compatible — a new host reading an old module
sees no event entries (zero events), and an old host reading a new
module just ignores the "type" field (cosmetic). An entry with no
"type" is treated as a method.

- logos_provider_object.h: remove the getEvents() virtual; document that
  getMethods() carries both, and why.
- generator (lidl_gen_provider): emit events as type "event" entries
  inside getMethods(); tag methods type "method"; no getEvents() output.
- module_proxy / qt_provider_object: getPluginMethods()/getPluginEvents()
  are now type-filtered views of getMethods(), plus a new
  getPluginInterface() returning the whole list. (These are name-
  dispatched Q_INVOKABLEs, not vtable surface — adding them is safe.)
- tests: generator asserts events fold into getMethods() tagged "event";
  ModuleProxy asserts the three filtered views; parser tests unchanged.
- docs: spec/project/docs/README updated, incl. an ABI rationale note.

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

---------

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

cpp/module_proxy.cpp

@@ -1,6 +1,8 @@
 #include "module_proxy.h"
 #include "logos_provider_object.h"
 #include <QDebug>
+#include <QJsonObject>
+#include <QJsonValue>
 
 ModuleProxy::ModuleProxy(LogosProviderObject* provider, QObject* parent)
     : QObject(parent)
@@ -66,6 +68,14 @@ QVariant ModuleProxy::callRemoteMethod(const QString& authToken, const QString&
         return QVariant(getPluginMethods());
     }
 
+    if (methodName == "getPluginEvents" && args.isEmpty()) {
+        return QVariant(getPluginEvents());
+    }
+
+    if (methodName == "getPluginInterface" && args.isEmpty()) {
+        return QVariant(getPluginInterface());
+    }
+
     qDebug() << "ModuleProxy: callRemoteMethod" << methodName << "args:" << args;
     return m_provider->callMethod(methodName, args);
 }
@@ -82,7 +92,24 @@ bool ModuleProxy::informModuleToken(const QString& authToken, const QString& mod
     return m_provider->informModuleToken(moduleName, token);
 }
 
-QJsonArray ModuleProxy::getPluginMethods()
+namespace {
+// getMethods() returns the module's full interface — both methods and events,
+// each tagged with a "type" ("method"/"event"). Split it back out. An entry
+// with no "type" counts as a method, so modules built against the pre-events
+// SDK (whose getMethods() contains no events) report zero events, not a crash.
+QJsonArray filterInterface(const QJsonArray& interface, bool keepEvents)
+{
+    QJsonArray out;
+    for (const QJsonValue& v : interface) {
+        const bool isEvent =
+            v.toObject().value(QStringLiteral("type")).toString() == QStringLiteral("event");
+        if (isEvent == keepEvents) out.append(v);
+    }
+    return out;
+}
+} // namespace
+
+QJsonArray ModuleProxy::getPluginInterface()
 {
     if (!m_provider) return QJsonArray();
 
@@ -90,4 +117,14 @@ QJsonArray ModuleProxy::getPluginMethods()
     return m_provider->getMethods();
 }
 
+QJsonArray ModuleProxy::getPluginMethods()
+{
+    return filterInterface(getPluginInterface(), /*keepEvents=*/false);
+}
+
+QJsonArray ModuleProxy::getPluginEvents()
+{
+    return filterInterface(getPluginInterface(), /*keepEvents=*/true);
+}
+
 #include "moc_module_proxy.cpp"