fix: improve cross-device evidence, request diagnostics and prompt efficiency

artemis/agents/flash/context_compressor.py

@@ -143,7 +143,11 @@ class ScrubEdgeCompressor:
         self._xml_candidates: list[int] = []
 
     def compress(
-        self, messages: list[BaseMessage], *, image_scrub_depth: int | None = None
+        self,
+        messages: list[BaseMessage],
+        *,
+        image_scrub_depth: int | None = None,
+        protected_message_ids: set[int] | None = None,
     ) -> None:
         """Advance the scrub edge over newly appended messages in-place.
 
@@ -156,7 +160,7 @@ class ScrubEdgeCompressor:
         self._discover(messages)
         if not self._tracked and not self._xml_candidates:
             return
-        self._scrub_edge(messages, image_scrub_depth)
+        self._scrub_edge(messages, image_scrub_depth, protected_message_ids)
 
     # ------------------------------------------------------------------
     # Discovery (incremental; frozen prefix is never rescanned)
@@ -211,7 +215,10 @@ class ScrubEdgeCompressor:
     # ------------------------------------------------------------------
 
     def _scrub_edge(
-        self, messages: list[BaseMessage], image_scrub_depth: int | None = None
+        self,
+        messages: list[BaseMessage],
+        image_scrub_depth: int | None = None,
+        protected_message_ids: set[int] | None = None,
     ) -> None:
         total = len(self._tracked)
         scrub_depth = max(1, int(image_scrub_depth or self._image_scrub_depth))
@@ -219,6 +226,8 @@ class ScrubEdgeCompressor:
         text_depth = self._xml_scrub_depth
 
         for pos, rec in enumerate(self._tracked):
+            if protected_message_ids and id(messages[rec["idx"]]) in protected_message_ids:
+                continue  # A newly delivered tool result must be seen before it can be scrubbed.
             if rec["idx"] in self._frozen:
                 continue
             # 1 == most recent image-bearing message; a live tail outside the