feat: recover evolving threads from freeform notes

app/schemas.py

@@ -44,12 +44,33 @@ class IdeaAssessment(BaseModel):
     trajectory: str = Field(min_length=1, max_length=280)
     possible_moves: list[str] = Field(min_length=1, max_length=4)
     relevance: float = Field(default=1, ge=0, le=1)
+    supporting_fragment_ids: list[str] = Field(
+        default_factory=list,
+        max_length=6,
+        description=(
+            "Ids of earlier fragments from recent_context that are substantive "
+            "evidence for this same evolving thread. The new fragment is linked "
+            "automatically and must not be included."
+        ),
+    )
 
     @field_validator("possible_moves")
     @classmethod
     def moves_are_brief(cls, moves: list[str]) -> list[str]:
         return [move.strip()[:100] for move in moves if move.strip()][:4]
 
+    @field_validator("supporting_fragment_ids")
+    @classmethod
+    def supporting_fragments_are_unique(
+        cls, fragment_ids: list[str]
+    ) -> list[str]:
+        unique: list[str] = []
+        for fragment_id in fragment_ids:
+            value = fragment_id.strip()
+            if value and value not in unique:
+                unique.append(value)
+        return unique[:6]
+
 
 class CuratorDecision(BaseModel):
     standalone: bool = Field(