put rest and sse to acceptance criteria. revise components. add system flows diagram

docs/02_components/12_route_chunk_manager/route_chunk_manager_spec.md

@@ -56,19 +56,51 @@ class IRouteChunkManager(ABC):
     def merge_chunks(self, chunk_id_1: str, chunk_id_2: str, transform: Sim3Transform) -> bool:
         pass
     
+    @abstractmethod
+    def get_merge_target(self, chunk_id: str) -> str:
+        """Returns target chunk_id for merging. Returns 'main' for main trajectory."""
+        pass
+    
     @abstractmethod
     def mark_chunk_matching(self, chunk_id: str) -> bool:
         pass
+    
+    @abstractmethod
+    def save_chunk_state(self, flight_id: str) -> bool:
+        """Persist all chunk state to F03 for crash recovery."""
+        pass
+    
+    @abstractmethod
+    def load_chunk_state(self, flight_id: str) -> bool:
+        """Load chunk state from F03 on restart."""
+        pass
 ```
 
 ## Component Description
 
 ### Responsibilities
+- **Source of truth for chunk state** (active, anchored, merged status)
 - Manage chunk lifecycle (creation, activation, deactivation, merging)
 - Track chunk state (frames, anchors, matching status)
-- Coordinate chunk semantic matching and LiteSAM matching
 - Provide chunk representations for matching (composite images, descriptors)
 - Determine chunk readiness for matching (min frames, consistency)
+- Persist chunk state via F03 Flight Database
+
+### Chunk Responsibility Clarification
+
+**F12 is the high-level chunk manager**:
+- Owns chunk state (ChunkHandle with matching_status, is_active, has_anchor)
+- Provides high-level queries: `get_active_chunk()`, `get_chunks_for_matching()`
+- Coordinates with F10 for factor graph operations
+- Persists chunk state for crash recovery
+
+**F10 provides low-level factor graph operations** (see F10 spec):
+- Subgraph creation and factor management
+- Does NOT own chunk state - only factor graph data
+
+**F11 coordinates recovery** (see F11 spec):
+- Calls F12 for chunk operations
+- F11 NEVER directly calls F10 chunk methods
 
 ### Scope
 - Chunk lifecycle management