🏗️ Architect: Fix hidden mutable state bug in ParamMixin._resolve_params

[fderuiter]

🏗️ Refactor Candidate: Mutable Dictionary Argument Bug in Param Resolution

The Smell:
In src/imednet/core/endpoint/mixins/params.py, the _resolve_params method receives an extra_params: Optional[Dict[str, Any]] argument and calls extra_params.update(special_params). This unintentionally modifies the dictionary passed by the caller in place, creating an implicit side effect and violating the rule against hidden mutable state.

The Fix:
I applied the "Defensive Copying" strategy. By explicitly assigning extra_params = extra_params.copy() before updating it, we ensure that the caller's dictionary is left completely intact.

The Code:

        if special_params:
            if extra_params is None:
                extra_params = {}
            else:
                extra_params = extra_params.copy()
            extra_params.update(special_params)

Verification:

• Types are strict (No Any introduced)
• Sync/Async parity maintained
• No logic changes, only structural safety

Architect's Advice:

• "If a function modifies an argument, the caller is no longer safe to use it. A defensive copy is cheaper than a mysterious bug in production."

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PR created automatically by Jules for task 17841403166980914882 started by @fderuiter

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