🏗️ Architect: Core Endpoint Mixins

[fderuiter]

This PR removes the unused cache argument from CacheMixin._update_local_cache and ListEndpointMixin._process_list_result as part of the codebase clean up by the Architect persona to reduce cognitive load and avoid primitive obsession.

Design Change:

• Removed unused arguments from internal caching logic.

DRY Gains:

• Eliminated redundant argument passing.

Solidity:

• The change is structurally safe and maintains sync/async parity.

Breaking Changes:

• None.

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PR created automatically by Jules for task 63551538659956523 started by @fderuiter

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