* refactor(tools): consolidate duplicated _truncate and get_mcp_manager into src/tool_utils
Move all copies of _truncate(), get_mcp_manager(), and set_mcp_manager()
into a single leaf module (src/tool_utils.py) that imports only from
src.constants. This eliminates the lazy-import hack
('from src import agent_tools' inside function bodies) in tool_execution.py
and tool_implementations.py, and fixes a latent bug: the _truncate copy in
tool_execution.py was missing the isinstance guard and would crash on None.
Also deletes mcp_servers/_common.py — it was dead code with zero callers
anywhere in the codebase, containing its own copy of truncate() and
constants that already exist in src/constants.py.
* fix(tools): route remaining get_mcp_manager imports to src.tool_utils
The maintainer's feedback flagged src/task_scheduler.py:1857 and
routes/task_routes.py:977. A project-wide search found a third call site
in src/agent_loop.py that also imported get_mcp_manager from
src.agent_tools instead of src.tool_utils.
All three are now sourced from the canonical location in src.tool_utils.
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Co-authored-by: mcnoliveira <mcnoliveira@gmail.com>
Mateus Oliveira