Allow injected global names like __NAME__ in naming convention

[sethlivingston]

Summary

Update the naming-convention rule configuration to allow build-time injected global constants using the common __NAME__ convention.

Context

During Vitest config integration in oneway-http, build-time injected constants like these were clearer and more expressive:

• __ONEWAY_HTTP_EXPECTED_ROOT_TARGET__
• __ONEWAY_HTTP_TEST_PROJECT__

The current naming convention rejected them, which pushed the code toward less expressive camelCase names for what are really compile-time injected constants.

Proposal

Allow a pattern like:

• ^__[_A-Z0-9]+__$

This should apply in the places where naming convention currently rejects these identifiers.

Acceptance criteria

• The recommended narrows config allows __NAME__-style injected constants.
• The rule remains strict for ordinary identifiers.
• Documentation includes a brief rationale/examples for allowed injected-global names.