The compute-owner allocation path is an intended hot path for CP shared KV. Falling back to legacy page allocation changes the behavior profile enough that INFO/no-marker logging is too easy to miss during profiling.
This makes the fallback warning-visible and gives it the standard CP shared-KV fallback marker while preserving the existing behavior of logging every fallback event.
Constraint: Production fallbacks from intended CP shared-KV hot paths must be visible and grep-able.
Rejected: Keep INFO logging | historical silent or low-visibility fallbacks hid inactive optimized paths.
Confidence: medium
Scope-risk: narrow
Directive: Keep fallback logs warning-level unless the path is proven to be expected steady state and separately observable.
Tested: Local py_compile for common.py and test_cp_shared_kv_layout.py.
Tested: Local extracted assertLogs check for _log_cp_shared_kv_alloc_fallback warning prefix and reason formatting.
Tested: Remote g0034 py_compile for common.py and test_cp_shared_kv_layout.py.
Not-tested: Full remote pytest for test_cp_shared_kv_layout.py; current g0034 container aborts while importing installed sgl_kernel common_ops before test execution.
Co-authored-by: OmX <omx@oh-my-codex.dev>
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