fix(macp): wire commander dep, registerMacpCommand export, and CLI registration

Add commander dependency to @mosaicstack/macp, export registerMacpCommand
from the package index, and register the macp command in the mosaic CLI.
These were missing from the previous rebase due to conflicting parallel
task merges. Ref CU-05-08.

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

packages/mosaic/src/cli.ts

@@ -5,6 +5,7 @@ import { Command } from 'commander';
 import { registerBrainCommand } from '@mosaicstack/brain';
 import { registerForgeCommand } from '@mosaicstack/forge';
 import { registerLogCommand } from '@mosaicstack/log';
+import { registerMacpCommand } from '@mosaicstack/macp';
 import { registerMemoryCommand } from '@mosaicstack/memory';
 import { registerQualityRails } from '@mosaicstack/quality-rails';
 import { registerQueueCommand } from '@mosaicstack/queue';
@@ -357,6 +358,10 @@ registerBrainCommand(program);
 
 registerForgeCommand(program);
 
+// ─── macp ────────────────────────────────────────────────────────────────
+
+registerMacpCommand(program);
+
 // ─── quality-rails ──────────────────────────────────────────────────────
 
 registerQualityRails(program);