feat: Implement new memory processing prompts and XML structures

- Added final finalize prompt for session summary generation with required XML fields.
- Introduced recommended prompt flow with structured observation format and hierarchical storage principles.
- Created final init prompt for processing tool executions with clear guidelines on when to store observations.
- Developed final observation prompt for analyzing tool outputs and generating structured observations.
- Migrated old prompt flow to a new system with improved clarity and structured data handling.
- Updated parser and storage mechanisms to accommodate new observation formats and fields.
- Enhanced documentation for new prompts and their usage in memory processing sessions.

docs/prompts/drafts/suggested-observation-prompt.md

@@ -0,0 +1,17 @@
+# Final Observation Prompt
+
+```
+TOOL OBSERVATION
+================
+Tool: {tool_name}
+Time: {timestamp}
+Prompt: {prompt_number}
+
+Input:
+{tool_input JSON}
+
+Output:
+{tool_output JSON}
+
+Analyze this tool output. If it contains information worth remembering, generate an observation using the XML format.
+```