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>

mcp_client.py

@@ -458,6 +458,47 @@ def py_get_class_summary(path: str, name: str) -> str:
  except Exception as e:
   return f"ERROR summarizing class '{name}' in '{path}': {e}"
 
+def py_get_var_declaration(path: str, name: str) -> str:
+ """Get the assignment/declaration line(s) for a module-level or class-level variable."""
+ p, err = _resolve_and_check(path)
+ if err:
+  return err
+ if not p.is_file() or p.suffix != ".py":
+  return f"ERROR: not a python file: {path}"
+ try:
+  import ast
+  code = p.read_text(encoding="utf-8").lstrip(chr(0xFEFF))
+  lines = code.splitlines(keepends=True)
+  tree = ast.parse(code)
+  node = _get_symbol_node(tree, name)
+  if not node or not isinstance(node, (ast.Assign, ast.AnnAssign)):
+   return f"ERROR: could not find variable '{name}' in {path}"
+  start = getattr(node, "lineno") - 1
+  end = getattr(node, "end_lineno")
+  return "".join(lines[start:end])
+ except Exception as e:
+  return f"ERROR retrieving variable '{name}' from '{path}': {e}"
+
+def py_set_var_declaration(path: str, name: str, new_declaration: str) -> str:
+ """Surgically replace a variable assignment/declaration."""
+ p, err = _resolve_and_check(path)
+ if err:
+  return err
+ if not p.is_file() or p.suffix != ".py":
+  return f"ERROR: not a python file: {path}"
+ try:
+  import ast
+  code = p.read_text(encoding="utf-8").lstrip(chr(0xFEFF))
+  tree = ast.parse(code)
+  node = _get_symbol_node(tree, name)
+  if not node or not isinstance(node, (ast.Assign, ast.AnnAssign)):
+   return f"ERROR: could not find variable '{name}' in {path}"
+  start = getattr(node, "lineno")
+  end = getattr(node, "end_lineno")
+  return set_file_slice(path, start, end, new_declaration)
+ except Exception as e:
+  return f"ERROR updating variable '{name}' in '{path}': {e}"
+
 def get_git_diff(path: str, base_rev: str = "HEAD", head_rev: str = "") -> str:
  """
     Returns the git diff for a file or directory.