v2.2.1: fix compaction orphaning tool outputs (tested, all 8 tests pass)

- Compaction now walks tail boundary past fc/fco/assistant to keep pairs intact
- All 8 pipeline tests pass: compaction, message translation, 5 Crof models
- reasoning_effort=none confirmed working: 0 reasoning on mimo/kimi/deepseek
- No orphaned function_call_output items after compaction

src/translate-proxy.py

@@ -240,9 +240,13 @@ def _compact_input(input_data):
     head = input_data[:head_end]
     tail_start = len(input_data) - _COMPACT_KEEP_RECENT
     while tail_start > head_end:
-        if input_data[tail_start].get("type") == "function_call_output":
+        t = input_data[tail_start].get("type")
+        r = input_data[tail_start].get("role", "")
+        if t == "function_call_output":
             tail_start -= 1
-        elif input_data[tail_start].get("type") == "message" and input_data[tail_start].get("role") == "assistant":
+        elif t == "function_call":
+            tail_start -= 1
+        elif t == "message" and r == "assistant":
             tail_start -= 1
         else:
             break