masci / banks / 27767342822

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fix: resolve tool callables from an explicit registry instead of importlib (#75)

The `tool` filter now registers each callable by name in
`CompletionExtension._callable_registry` at render time. `_get_tool_callable`
looks up callables exclusively from this registry — `importlib.import_module`
is no longer used — so only developer-supplied functions are ever invocable.

`Tool.import_path` is also excluded from the payload sent to the LLM, as the
field carries no meaning for the model and should not be exposed.

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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