feat(commands,audit): add /context command and proactive compaction audit events

src/commands/builtin/index.test.ts

@@ -1,6 +1,6 @@
 import { describe, it, expect, vi } from 'vitest';
 
-import { createElevateCommand, createModelCommand, createQueueCommand } from './index.js';
+import { createContextCommand, createElevateCommand, createModelCommand, createQueueCommand } from './index.js';
 
 describe('builtin /model command', () => {
   it('passes through the full argument string', async () => {
@@ -111,3 +111,31 @@ describe('builtin /queue command', () => {
     expect(result).toEqual({ handled: true, text: 'reset' });
   });
 });
+
+describe('builtin /context command', () => {
+  it('returns context usage text from services', async () => {
+    const cmd = createContextCommand();
+    const getContext = vi.fn(() => 'Context Usage\n\n75.0%');
+    const result = await cmd.execute([], {
+      channel: 'test',
+      senderId: 'user',
+      sessionId: 's1',
+      rawInput: '/context',
+      services: { getContext },
+    });
+    expect(getContext).toHaveBeenCalledOnce();
+    expect(result).toEqual({ handled: true, text: 'Context Usage\n\n75.0%' });
+  });
+
+  it('returns not-available when service is missing', async () => {
+    const cmd = createContextCommand();
+    const result = await cmd.execute([], {
+      channel: 'test',
+      senderId: 'user',
+      sessionId: 's1',
+      rawInput: '/context',
+      services: {},
+    });
+    expect(result).toEqual({ handled: true, text: 'Context command is not available in this session.' });
+  });
+});