Remove memory_research (depended on unreliable SearXNG); research now uses built-in web_search

ARCHITECTURE.md

@@ -1,7 +1,7 @@
 # Pegas Memory — Architecture
 
 Pegas Memory is the long-term memory and knowledge base for the **Pegas** research agent.
-It is a Python service exposed to the agent as an **MCP server** (14 tools).
+It is a Python service exposed to the agent as an **MCP server** (13 tools).
 
 ---
 
@@ -14,7 +14,7 @@ It is a Python service exposed to the agent as an **MCP server** (14 tools).
                  └───────────────────┬──────────────────────┘
                                      │  JSON-RPC 2.0 / stdio
                  ┌───────────────────▼──────────────────────┐
-                 │  mcp_server.py  (tool layer, 14 tools)   │
+                 │  mcp_server.py  (tool layer, 13 tools)   │
                  └───────────────────┬──────────────────────┘
                                      │  Python API
         ┌────────────────────────────┼────────────────────────────┐
@@ -153,7 +153,7 @@ Only single-token kinds (no spaces) are accepted — human-readable rules from d
 
 ---
 
-## 6. MCP tools (14)
+## 6. MCP tools (13)
 
 | Tool | Purpose |
 |---|---|
@@ -165,7 +165,6 @@ Only single-token kinds (no spaces) are accepted — human-readable rules from d
 | `memory_verify` | self-critique + cross-confirmation |
 | `memory_add_gap` | register a research gap |
 | `memory_list_gaps` | list open gaps |
-| `memory_research` | full research cycle for one question |
 | `memory_store_code` | extract + store code symbols |
 | `memory_search_code` | lexical search over code symbols |
 | `memory_code_graph` | build symbol + dependency graph |