fix: prune dead web_search tool — ddgs never installed (#87)

Remove DuckDuckGoTools import, all web_search registrations across 4 toolkit
factories, catalog entry, safety classification, prompt references, and
session regex. Total: -41 lines of dead code.

consult_grok is functional (grok_enabled=True, API key set) and opt-in,
so it stays — but Timmy never calls it autonomously, which is correct
sovereign behavior (no cloud calls unless user permits).

Closes #87

src/timmy/tools.py

@@ -1,7 +1,6 @@
 """Tool integration for the agent swarm.
 
 Provides agents with capabilities for:
-- Web search (DuckDuckGo)
 - File read/write (local filesystem)
 - Shell command execution (sandboxed)
 - Python code execution
@@ -38,15 +37,6 @@ except ImportError as e:
     _AGNO_TOOLS_AVAILABLE = False
     _ImportError = e
 
-# DuckDuckGo is optional — don't let it kill all tools
-try:
-    from agno.tools.duckduckgo import DuckDuckGoTools
-
-    _DUCKDUCKGO_AVAILABLE = True
-except ImportError:
-    _DUCKDUCKGO_AVAILABLE = False
-    DuckDuckGoTools = None  # type: ignore[assignment, misc]
-
 # Track tool usage stats
 _TOOL_USAGE: dict[str, list[dict]] = {}
 
@@ -228,17 +218,12 @@ def _make_smart_read_file(file_tools: FileTools) -> Callable:
 def create_research_tools(base_dir: str | Path | None = None):
     """Create tools for the research agent (Echo).
 
-    Includes: web search, file reading
+    Includes: file reading
     """
     if not _AGNO_TOOLS_AVAILABLE:
         raise ImportError(f"Agno tools not available: {_ImportError}")
     toolkit = Toolkit(name="research")
 
-    # Web search via DuckDuckGo
-    if _DUCKDUCKGO_AVAILABLE:
-        search_tools = DuckDuckGoTools()
-        toolkit.register(search_tools.web_search, name="web_search")
-
     # File reading
     from config import settings
 
@@ -355,11 +340,6 @@ def create_data_tools(base_dir: str | Path | None = None):
     toolkit.register(_make_smart_read_file(file_tools), name="read_file")
     toolkit.register(file_tools.list_files, name="list_files")
 
-    # Web search for finding datasets
-    if _DUCKDUCKGO_AVAILABLE:
-        search_tools = DuckDuckGoTools()
-        toolkit.register(search_tools.web_search, name="web_search")
-
     return toolkit
 
 
@@ -385,7 +365,7 @@ def create_writing_tools(base_dir: str | Path | None = None):
 def create_security_tools(base_dir: str | Path | None = None):
     """Create tools for the security agent (Mace).
 
-    Includes: shell commands (for scanning), web search (for threat intel), file read
+    Includes: shell commands (for scanning), file read
     """
     if not _AGNO_TOOLS_AVAILABLE:
         raise ImportError(f"Agno tools not available: {_ImportError}")
@@ -395,11 +375,6 @@ def create_security_tools(base_dir: str | Path | None = None):
     shell_tools = ShellTools()
     toolkit.register(shell_tools.run_shell_command, name="shell")
 
-    # Web search for threat intelligence
-    if _DUCKDUCKGO_AVAILABLE:
-        search_tools = DuckDuckGoTools()
-        toolkit.register(search_tools.web_search, name="web_search")
-
     # File reading for logs/configs
     base_path = Path(base_dir) if base_dir else Path(settings.repo_root)
     file_tools = FileTools(base_dir=base_path)
@@ -510,13 +485,6 @@ def create_full_toolkit(base_dir: str | Path | None = None):
     # Function gets requires_confirmation=True).  Fixes #79.
     toolkit.requires_confirmation_tools = list(DANGEROUS_TOOLS)
 
-    # Web search (optional — degrades gracefully if ddgs not installed)
-    if _DUCKDUCKGO_AVAILABLE:
-        search_tools = DuckDuckGoTools()
-        toolkit.register(search_tools.web_search, name="web_search")
-    else:
-        logger.debug("DuckDuckGo tools unavailable (ddgs not installed) — skipping web_search")
-
     # Python execution
     python_tools = PythonTools()
     toolkit.register(python_tools.run_python_code, name="python")
@@ -739,11 +707,6 @@ def get_all_available_tools() -> dict[str, dict]:
         Dict mapping tool categories to their tools and descriptions.
     """
     catalog = {
-        "web_search": {
-            "name": "Web Search",
-            "description": "Search the web using DuckDuckGo",
-            "available_in": ["echo", "seer", "mace", "orchestrator"],
-        },
         "shell": {
             "name": "Shell Commands",
             "description": "Execute shell commands (sandboxed)",