fix(runtime): register configs_dir in TOP_LEVEL_MODULES + drop alias

Wheel-build smoke gate detected `configs_dir` missing from
scripts/build_runtime_package.py:TOP_LEVEL_MODULES. Without it the
build would ship `import configs_dir` un-rewritten and every
external-runtime install would die on `ModuleNotFoundError` at first
import.

Two callers used `import configs_dir as _configs_dir` to belt-and-
suspenders against an imagined name collision, but the rewriter
rejects `import X as Y` because the rewrite would produce
`import molecule_runtime.X as X as Y` (invalid syntax). No actual
collision exists (only docstring/comment references). Switched to
plain `import configs_dir`.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/build_runtime_package.py

@@ -59,6 +59,7 @@ TOP_LEVEL_MODULES = {
     "agent",
     "agents_md",
     "config",
+    "configs_dir",
     "consolidation",
     "coordinator",
     "events",

workspace/inbox.py

@@ -55,7 +55,7 @@ from dataclasses import dataclass, field
 from pathlib import Path
 from typing import Any, Callable
 
-import configs_dir as _configs_dir
+import configs_dir
 
 logger = logging.getLogger(__name__)
 
@@ -524,4 +524,4 @@ def default_cursor_path() -> Path:
     + .platform_inbound_secret regardless of whether the runtime is
     in-container (/configs) or external (~/.molecule-workspace).
     """
-    return _configs_dir.resolve() / ".mcp_inbox_cursor"
+    return configs_dir.resolve() / ".mcp_inbox_cursor"

workspace/mcp_cli.py

@@ -41,7 +41,7 @@ import threading
 import time
 from pathlib import Path
 
-import configs_dir as _configs_dir
+import configs_dir
 
 logger = logging.getLogger(__name__)
 
@@ -380,7 +380,7 @@ def main() -> None:
     # env-fallback). configs_dir.resolve() handles in-container vs
     # external-runtime fallback so we don't probe a non-existent
     # /configs on a laptop and falsely report no-token-file.
-    has_token_file = (_configs_dir.resolve() / ".auth_token").is_file()
+    has_token_file = (configs_dir.resolve() / ".auth_token").is_file()
     has_token_env = bool(os.environ.get("MOLECULE_WORKSPACE_TOKEN", "").strip())
     if not has_token_file and not has_token_env:
         missing.append("MOLECULE_WORKSPACE_TOKEN (or CONFIGS_DIR/.auth_token)")
@@ -473,7 +473,7 @@ def _read_token_file() -> str:
     to inline a 4-line file read than pull in the whole stack just for
     the path).
     """
-    path = _configs_dir.resolve() / ".auth_token"
+    path = configs_dir.resolve() / ".auth_token"
     if not path.is_file():
         return ""
     try: