* fix(mcp): eliminate duplicate config loading during startup
load_mcp_config() was called twice on every startup — once in
_mcp_config_signature() to compute the cache key, and again inside
load_mcp_tools(). This caused warnings to appear twice.
Merge the two calls into _load_mcp_config_once() which returns both the
signature and the parsed config, then pass the config through to
load_mcp_tools() via a new optional parameter.
* test(mcp): fix existing cache tests and add coverage for single-load guarantee
- Update fake_load_mcp_tools to accept optional config kwarg
- Add test_load_mcp_config_called_once_per_cache_miss: verifies
load_mcp_config is called exactly once per cache miss (the bug)
- Add test_cached_config_passed_to_load_mcp_tools: verifies the
pre-loaded config dict is forwarded to load_mcp_tools
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Co-authored-by: Xi Zhang <106144707+X-iZhang@users.noreply.github.com>
dinos
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