checkpoint: Claude Code integration + implement missing MCP var tools

Add Claude Code conductor commands, MCP server, MMA exec scripts,
and implement py_get_var_declaration / py_set_var_declaration which
were registered in dispatch and tool specs but had no function bodies.

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

.claude/settings.local.json

@@ -0,0 +1,3 @@
+{
+  "outputStyle": "default"
+}