feat(conversations): pre-SDK rows read from canonical messages, implied titles, markdown adopts them by first prompt

src/beaver_gateway/frontends/markdown/frontend.py

@@ -392,6 +392,7 @@ class MarkdownFrontend(Frontend):
             metadata=parsed.metadata,
             agent_name=agent.name,
             file_path=file_path,
+            first_user_text=parsed.turns[0].text,
         )
         outcome = diff_and_fork(stored=stored_msgs, incoming=parsed.turns)
         capture = TurnCapture()
@@ -587,6 +588,7 @@ class MarkdownFrontend(Frontend):
                 metadata=parsed.metadata,
                 agent_name=agent.name,
                 file_path=file_path,
+                first_user_text=parsed.turns[0].text,
             )
         except HTTPException as exc:
             yield sse_pack(
@@ -823,13 +825,15 @@ class MarkdownFrontend(Frontend):
         metadata: dict[str, Any],
         agent_name: str,
         file_path: Path,
+        first_user_text: str = "",
     ) -> tuple[Conversation, str, list[dict[str, Any]]]:
         """Resolve the ``deep`` conversation for this file + its stored messages.
 
         Frontmatter ``conversation_id`` wins; a file that lost it is found
-        by its visible ``(markdown, path)`` binding; otherwise a new
-        conversation is created. The binding follows the file: a moved
-        chat re-binds to its new path on the next turn.
+        by its visible ``(markdown, path)`` binding, then by adopting the
+        one unbound pre-SDK conversation that starts with the same prompt;
+        otherwise a new conversation is created. The binding follows the
+        file: a moved chat re-binds to its new path on the next turn.
         """
         conversations = runtime.conversations
         rel = file_path.relative_to(self.vault_path).as_posix()
@@ -837,6 +841,12 @@ class MarkdownFrontend(Frontend):
         conv = await conversations.get(raw) if isinstance(raw, str) and raw else None
         if conv is None:
             conv = await conversations.find_bound(frontend=FRONTEND, external_id=rel)
+        if conv is None:
+            conv = await conversations.adopt(
+                kind="deep", first_user_text=first_user_text
+            )
+            if conv is not None:
+                _log.info("adopted conversation %s for %s", conv.external_id, rel)
         if conv is None:
             try:
                 conv = await conversations.create(