feat(infospace): add lifecycle CLI commands — init, status, entities, viability (S2.2)

Adds 'markitect infospace' command group with init (create config),
status (entity count/domains/disciplines), entities (list with sort),
and viability (threshold dashboard with pass/fail).

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

markitect/cli.py

@@ -7147,6 +7147,13 @@ try:
 except ImportError:
     pass  # Helper module not available
 
+# Register infospace commands
+try:
+    from markitect.infospace.cli import infospace_commands
+    cli.add_command(infospace_commands)
+except ImportError:
+    pass  # Infospace module not available
+
 # Register proxy file system commands
 try:
     from markitect.proxy.cli import proxy_group