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1b74360365
## Why Memory startup runs in the background after an eligible turn, but it can consume Codex backend quota at exactly the wrong time: when the user is already near a rate-limit boundary. This PR adds a guard so the memory pipeline backs off when the Codex rate-limit snapshot says the remaining budget is too low. ## What Changed - Added `memories.min_rate_limit_remaining_percent` with a default of `25`, clamped to `0..=100`, and regenerated `core/config.schema.json`. - Added `codex-rs/memories/write/src/guard.rs`, which fetches Codex backend rate limits before memory startup and skips phase 1 / phase 2 when the Codex limit is reached or either tracked window is above the configured usage ceiling. - Keeps startup best-effort: non-Codex auth or rate-limit fetch/client failures preserve the existing memory startup behavior. - Records a `codex.memory.startup` counter with `status=skipped_rate_limit` when startup is skipped. - Added config parsing/clamping coverage and guard unit tests. ## Verification - Added `codex-rs/memories/write/src/guard_tests.rs` for threshold, primary/secondary window, and reached-limit behavior. - Added config tests for TOML parsing and clamping.