Tier-2-GC follow-on (design §9.12 flagged vestige). The metadata's `committed`
bool and `committed_payload_layers` dict were write-only residue of the option-A
quorum the GC removed: set at construction, validated in __post_init__, copied in
split() -- but their only content/True writer was the deleted
_commit_cp_shared_l2_layers_batched. Verified tree-wide there is NO live reader
(`committed` appears only in split's `committed=self.committed` copy;
`committed_payload_layers` only in __post_init__ validation + split copy +
construction). Commit consensus under B1 is the allocator's `_committed_objects`
(MIN frontier), so `metadata.committed` was a redundant second source of truth.
CORRECTION to the original flag: `required_payloads` is NOT a vestige -- it is
LIVE (read by cache_controller.load_cp_shared_l2, the evict path hiradix:2748,
and the readback payload planning). KEPT.
Removed: the 2 dataclass fields + their __post_init__ validation + the two split()
child-copies + the cache_controller reserve-construction kwargs + 4 test
constructions/assertions. No behavior change (fields were never read). Pool suite
88/88 (syh-dev-new/torch-2.11 env) + import smoke confirm the metadata dataclass is
now {logical_len, padded_len, page_size, object_ranges, required_payloads, object_key}.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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