revert /name for now

[dedrisian-oai]

There was a regression where we'd read entire rollout contents if there was no /name present.

[chatgpt-codex-connector]

💡 Codex Review

https://github.com/openai/codex/blob/74f4e6611f0009ea4c7d33cea07f2369864192cd/codex-rs/core/src/rollout/list.rs#L433-L449
Avoid rescanning entire rollout when no rename exists

The new logic in read_tail_records keeps reading backwards until both the tail is filled and a SessionRenamed event is discovered. For most conversations there is no rename event, so latest_name stays None and the loop runs until pos == 0, effectively reading the entire JSONL file just to return the last 10 responses. get_conversations invokes this for every rollout it touches, so listing rollouts now degrades from O(tail_limit) to O(file_size) I/O per file whenever a name was never set, which can be megabytes per file across thousands of sessions. Consider short‑circuiting once the tail is populated when no rename is required, or bounding the scan with a cap/cached flag so listing sessions does not regress to full file reads.

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