fix(bicep): support multi-line array completion for roles and other enums

Adds support for autocomplete in multi-line array syntax like:

    roles: [
      'KEY_VAULT_  ← cursor triggers completion here
    ]

Previously only worked on same line as opening bracket:
    roles: ['KEY_VAULT_  ← only this worked

Changes:
- Walk backwards up to 10 lines to find array opening (e.g. "roles: [")
- Detect if cursor is inside array based on indentation and quotes
- Stop lookback if closing bracket found (not in array anymore)
- Add test case for nested multi-line array completion
- Improve lsp_bridge.py error handling with traceback logging
- Add lsp_bridge_debug.sh wrapper for easier IntelliJ debugging
- Update EDITOR_SETUP.md with correct IntelliJ LSP4IJ config

Fixes autocomplete for deeply nested structures like:
    assignments: [{ roles: ['APP_CONFIGURATION_...'] }]

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

scripts/lsp_bridge.py

@@ -17,6 +17,7 @@ frames straight to stdout.
 import asyncio
 import ssl
 import sys
+import traceback
 
 import websockets
 
@@ -71,8 +72,9 @@ async def main(uri: str) -> None:
                     if msg is None:
                         break
                     await ws.send(msg)
-            except Exception:
-                pass
+            except Exception as e:
+                print(f"stdin_to_ws error: {e}", file=sys.stderr)
+                traceback.print_exc(file=sys.stderr)
 
         async def ws_to_stdout() -> None:
             try:
@@ -80,8 +82,9 @@ async def main(uri: str) -> None:
                     data = frame if isinstance(frame, bytes) else frame.encode()
                     sys.stdout.buffer.write(data)
                     sys.stdout.buffer.flush()
-            except Exception:
-                pass
+            except Exception as e:
+                print(f"ws_to_stdout error: {e}", file=sys.stderr)
+                traceback.print_exc(file=sys.stderr)
 
         await asyncio.gather(stdin_to_ws(), ws_to_stdout())
 
@@ -90,4 +93,9 @@ if __name__ == "__main__":
     if len(sys.argv) < 2:
         print("Usage: lsp_bridge.py <wss://...>", file=sys.stderr)
         sys.exit(1)
-    asyncio.run(main(sys.argv[1]))
+    try:
+        asyncio.run(main(sys.argv[1]))
+    except Exception as e:
+        print(f"Fatal error: {e}", file=sys.stderr)
+        traceback.print_exc(file=sys.stderr)
+        sys.exit(1)