feat(memory): add registerMemoryCommand for mosaic memory CLI surface

Adds mosaic memory CLI with four subcommands: search, stats,
insights list, and preferences list. Commands accept --db flag
(or MEMORY_DB_URL/DATABASE_URL env) to connect to pgvector or
keyword adapter. Smoke tests verify command wiring without DB.

Task: CU-05-04

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/memory/src/cli.spec.ts

@@ -0,0 +1,63 @@
+import { describe, it, expect } from 'vitest';
+import { Command } from 'commander';
+import { registerMemoryCommand } from './cli.js';
+
+/**
+ * Smoke test — only verifies command wiring.
+ * Does NOT open a database connection.
+ */
+describe('registerMemoryCommand', () => {
+  function buildProgram(): Command {
+    const program = new Command('mosaic');
+    program.exitOverride(); // prevent process.exit during tests
+    registerMemoryCommand(program);
+    return program;
+  }
+
+  it('registers a "memory" subcommand', () => {
+    const program = buildProgram();
+    const memory = program.commands.find((c) => c.name() === 'memory');
+    expect(memory).toBeDefined();
+  });
+
+  it('registers "memory search"', () => {
+    const program = buildProgram();
+    const memory = program.commands.find((c) => c.name() === 'memory')!;
+    const search = memory.commands.find((c) => c.name() === 'search');
+    expect(search).toBeDefined();
+  });
+
+  it('registers "memory stats"', () => {
+    const program = buildProgram();
+    const memory = program.commands.find((c) => c.name() === 'memory')!;
+    const stats = memory.commands.find((c) => c.name() === 'stats');
+    expect(stats).toBeDefined();
+  });
+
+  it('registers "memory insights list"', () => {
+    const program = buildProgram();
+    const memory = program.commands.find((c) => c.name() === 'memory')!;
+    const insights = memory.commands.find((c) => c.name() === 'insights');
+    expect(insights).toBeDefined();
+    const list = insights!.commands.find((c) => c.name() === 'list');
+    expect(list).toBeDefined();
+  });
+
+  it('registers "memory preferences list"', () => {
+    const program = buildProgram();
+    const memory = program.commands.find((c) => c.name() === 'memory')!;
+    const preferences = memory.commands.find((c) => c.name() === 'preferences');
+    expect(preferences).toBeDefined();
+    const list = preferences!.commands.find((c) => c.name() === 'list');
+    expect(list).toBeDefined();
+  });
+
+  it('"memory search" has --limit and --agent options', () => {
+    const program = buildProgram();
+    const memory = program.commands.find((c) => c.name() === 'memory')!;
+    const search = memory.commands.find((c) => c.name() === 'search')!;
+    const optNames = search.options.map((o) => o.long);
+    expect(optNames).toContain('--limit');
+    expect(optNames).toContain('--agent');
+  });
+});