Enhance memory search functionality with timeline context retrieval (#151)

- Introduced optional timeline context retrieval step in memory search flow to provide users with better understanding of previous sessions.
- Updated SKILL.md to reflect new flow, including timeline context commands and usage scenarios.
- Refactored timeline retrieval commands in timeline-by-query.md and timeline.md to utilize new MCP tools for streamlined access.
- Implemented filtering logic in search-server.ts to respect depth_before and depth_after parameters when displaying timeline items.
- Improved response formatting to include filtered item counts and enhanced user guidance for timeline queries.

plugin/skills/mem-search/operations/timeline-by-query.md

@@ -9,14 +9,16 @@ Search for observations and get timeline context in a single request. Combines s
 - User asks: "Timeline of database work"
 - Need to find something then see temporal context
 
-## Command
+## MCP Tool
 
-```bash
+Use the `get_timeline_by_query` MCP tool:
+
+```
 # Auto mode: Uses top search result as timeline anchor
-curl -s "http://localhost:37777/api/timeline/by-query?query=authentication&mode=auto&depth_before=10&depth_after=10"
+get_timeline_by_query(query="authentication", mode="auto", depth_before=10, depth_after=10)
 
 # Interactive mode: Shows top N search results for manual selection
-curl -s "http://localhost:37777/api/timeline/by-query?query=authentication&mode=interactive&limit=5"
+get_timeline_by_query(query="authentication", mode="interactive", limit=5)
 ```
 
 ## Parameters
@@ -34,8 +36,8 @@ curl -s "http://localhost:37777/api/timeline/by-query?query=authentication&mode=
 
 Automatically gets timeline around best match:
 
-```bash
-curl -s "http://localhost:37777/api/timeline/by-query?query=JWT+authentication&mode=auto&depth_before=10&depth_after=10"
+```
+get_timeline_by_query(query="JWT authentication", mode="auto", depth_before=10, depth_after=10)
 ```
 
 **Response:**
@@ -64,8 +66,8 @@ curl -s "http://localhost:37777/api/timeline/by-query?query=JWT+authentication&m
 
 Shows top search results for manual review:
 
-```bash
-curl -s "http://localhost:37777/api/timeline/by-query?query=authentication&mode=interactive&limit=5"
+```
+get_timeline_by_query(query="authentication", mode="interactive", limit=5)
 ```
 
 **Response:**
@@ -89,7 +91,7 @@ curl -s "http://localhost:37777/api/timeline/by-query?query=authentication&mode=
       "score": 0.87
     }
   ],
-  "next_step": "Use /api/timeline/context?anchor=<id>&depth_before=10&depth_after=10"
+  "next_step": "Use get_context_timeline(anchor=<id>, depth_before=10, depth_after=10)"
 }
 ```