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## Why `model_auto_compact_token_limit` has only been able to budget the full active context. That makes it hard to set a small "growth since compaction" budget for sessions that preserve a large carried window prefix: the preserved prefix can consume the whole budget and force immediate repeated compaction. This PR adds an opt-in `body_after_prefix` scope so callers can apply `model_auto_compact_token_limit` to sampled output and later growth after the current carried prefix, while still forcing compaction before the full model context window is exhausted. ## What changed - Adds `AutoCompactTokenLimitScope` with the existing `total` behavior as the default and a new `body_after_prefix` mode: [`config_types.rs`](https://github.com/openai/codex/blob/973806b1cb35792555bead994cb3ed94656eb171/codex-rs/protocol/src/config_types.rs#L24-L37). - Threads `model_auto_compact_token_limit_scope` through config loading, `Config`, `core-api`, and app-server v2 schema/TypeScript generation. - Records the first observed input-token count for a `body_after_prefix` compaction window and uses it as the baseline when deciding whether the scoped auto-compaction budget is exhausted: [`turn.rs`](https://github.com/openai/codex/blob/973806b1cb35792555bead994cb3ed94656eb171/codex-rs/core/src/session/turn.rs#L743-L781). - Keeps a hard context-window cap in `body_after_prefix`, so scoped budgeting cannot let the active context overrun the usable window. ## Verification Added compact-suite coverage for the two key behaviors: `body_after_prefix` does not re-compact just because the carried prefix is larger than the scoped budget, and it still compacts when the total active context reaches the configured context window: [`compact.rs`](https://github.com/openai/codex/blob/973806b1cb35792555bead994cb3ed94656eb171/codex-rs/core/tests/suite/compact.rs#L3003-L3128).
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