Add guarded return-wrapping fast path for internal `_aswhest` usage

[spMohanty]

wrap_module_returns and _aswhest currently wrap/copy array outputs in all paths, including internal/private call sites where WhesArray subclass semantics are not externally observable.

Introduce an internal fast path that can skip _aswhest in trusted call sites while preserving current public behavior by default.

Files

• src/whest/_ndarray.py

Acceptance Criteria

• Public API semantics (including documented subclass/OWNDATA behavior) remain unchanged by default.
• Internal callers can opt into the fast path.
• Existing compatibility and xfail expectations remain valid.