Fix crewai reset-memories when Embedding dimension mismatch (#2737)

* fix: support to reset memories after changing Crew's embedder

The sources must not be added while initializing the Knowledge otherwise we could not reset it

* chore: improve reset memory feedback

Previously, even when no memories were actually erased, we logged that they had been. From now on, the log will specify which memory has been reset.

* feat: improve get_crew discovery from a single file

Crew instances can now be discovered from any function or method with a return type annotation of -> Crew, as well as from module-level attributes assigned to a Crew instance. Additionally, crews can be retrieved from within a Flow

* refactor: make add_sources a public method from Knowledge

src/crewai/crew.py

@@ -304,7 +304,9 @@ class Crew(BaseModel):
         """Initialize private memory attributes."""
         self._external_memory = (
             # External memory doesn’t support a default value since it was designed to be managed entirely externally
-            self.external_memory.set_crew(self) if self.external_memory else None
+            self.external_memory.set_crew(self)
+            if self.external_memory
+            else None
         )
 
         self._long_term_memory = self.long_term_memory
@@ -333,6 +335,7 @@ class Crew(BaseModel):
                         embedder=self.embedder,
                         collection_name="crew",
                     )
+                    self.knowledge.add_sources()
 
             except Exception as e:
                 self._logger.log(
@@ -1369,8 +1372,6 @@ class Crew(BaseModel):
             else:
                 self._reset_specific_memory(command_type)
 
-            self._logger.log("info", f"{command_type} memory has been reset")
-
         except Exception as e:
             error_msg = f"Failed to reset {command_type} memory: {str(e)}"
             self._logger.log("error", error_msg)
@@ -1391,8 +1392,14 @@ class Crew(BaseModel):
             if system is not None:
                 try:
                     system.reset()
+                    self._logger.log(
+                        "info",
+                        f"[Crew ({self.name if self.name else self.id})] {name} memory has been reset",
+                    )
                 except Exception as e:
-                    raise RuntimeError(f"Failed to reset {name} memory") from e
+                    raise RuntimeError(
+                        f"[Crew ({self.name if self.name else self.id})] Failed to reset {name} memory: {str(e)}"
+                    ) from e
 
     def _reset_specific_memory(self, memory_type: str) -> None:
         """Reset a specific memory system.
@@ -1421,5 +1428,11 @@ class Crew(BaseModel):
 
         try:
             memory_system.reset()
+            self._logger.log(
+                "info",
+                f"[Crew ({self.name if self.name else self.id})] {name} memory has been reset",
+            )
         except Exception as e:
-            raise RuntimeError(f"Failed to reset {name} memory") from e
+            raise RuntimeError(
+                f"[Crew ({self.name if self.name else self.id})] Failed to reset {name} memory: {str(e)}"
+            ) from e