feat: add emulated tool-calling bridge for Lingma

Add a proxy-side tool emulation layer so Lingma requests can surface stable OpenAI tool_calls and Anthropic tool_use blocks even when upstream tool events are missing or inconsistent.

Constraint: Keep native Lingma tool event bridging as the first path and layer emulation as a fallback

Rejected: Depend exclusively on Lingma native tool/invoke events | tool visibility remains inconsistent across models and transports

Confidence: high

Scope-risk: moderate

app/bootstrap_lingma.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 import io
 import json
 import os
+import shutil
 import time
 import urllib.request
 import zipfile
@@ -70,6 +71,15 @@ def _extract_release_tree(
             dst.write(src.read())
 
 
+def _release_dir_for_binary(lingma_bin: Path, release_root: str | None) -> Path:
+    return lingma_bin.parent / ((release_root or "").strip() or "2.5.20")
+
+
+def _release_has_required_assets(release_dir: Path) -> bool:
+    extension_main = release_dir / "extension" / "main.js"
+    return extension_main.exists() and extension_main.is_file()
+
+
 def _query_marketplace_latest_vsix(
     publisher: str, extension: str
 ) -> tuple[str, str, dict]:
@@ -168,8 +178,19 @@ def bootstrap_from_vsix() -> None:
             )
             resolved_url = vsix_url
 
+    current_release_dir = _release_dir_for_binary(
+        lingma_bin, old_marker.get("release_root") if isinstance(old_marker, dict) else None
+    )
+    release_ready = _release_has_required_assets(current_release_dir)
+    if lingma_bin.exists() and not release_ready:
+        print(
+            "[bootstrap] existing Lingma binary found but extension assets are incomplete; "
+            f"refreshing install under {current_release_dir}"
+        )
+
     if (
         lingma_bin.exists()
+        and release_ready
         and not force_refresh
         and (
             (not always_refresh)
@@ -215,7 +236,8 @@ def bootstrap_from_vsix() -> None:
             lingma_bytes = inner_zip.read(lingma_member)
             release_root = _infer_release_root(lingma_member)
             lingma_bin.parent.mkdir(parents=True, exist_ok=True)
-            release_dir = lingma_bin.parent / (release_root or "2.5.20")
+            release_dir = _release_dir_for_binary(lingma_bin, release_root)
+            shutil.rmtree(release_dir, ignore_errors=True)
             _extract_release_tree(inner_zip, release_root, release_dir)
 
         lingma_bin.write_bytes(lingma_bytes)
@@ -224,7 +246,9 @@ def bootstrap_from_vsix() -> None:
         if extension_main.exists():
             print(f"[bootstrap] extension ready: {extension_main}")
         else:
-            print(f"[bootstrap] extension missing under: {release_dir}")
+            raise RuntimeError(
+                f"extension assets missing after extraction under: {release_dir}"
+            )
 
         marker = {
             "source": source_type,