server_args: --enable-cp-l3 + --cp-l3-config fields/args. Validation (R1 HIGH-2): do NOT re-gate
the 6 CP storage forbids (they gate on hicache_storage_backend and correctly never fire); instead
assert enable_cp_l3 is mutually exclusive with hicache_storage_backend, requires
enable_cp_shared_physical_l2_hicache, and requires cp_l3_config.
hiradix: self.enable_cp_l3 (CP-only) + cp_l3_store placeholder; compute_node_hash_values now also
fires under enable_cp_l3 (the per-page content hash is L3's key) — clean-boot only (R1 HIGH-3).
Default-off + behavior-neutral; store construction + drain follow.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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