**Problem**: Three bugs since v1.13.6. (1) **Subagent state isolation failure** (PR #184): ACP stored a single global `SessionState` per plugin instance. When subagent (child) sessions ran interleaved with the parent, the child's state overwrote the parent's `modelContextLimit` — losing the 1M context window and falling back to the 6K adaptive floor, causing over-aggressive nudging in the parent. The `compressionTiming` tracker was also shared across sessions, risking cross-session collision. (2) **Inactive block opacity** (PR #193): `decompress` rejected inactive blocks with "not active — may have already been decompressed", and `acp_status` hid consumed/inactive blocks entirely. Users could not decompress blocks that were GC'd or consumed by secondary compression, and could not see them in status output. (3) **Zero-user session freeze** (PR #196): When compression pruned all user-role messages (all fell inside compressed ranges), zhipuai-lb rejected the request with HTTP 400 code 1214 (`"messages 参数非法"`, `isRetryable: false`), freezing the session. The v1.13.2 `preserve-last-user` fix searched the messages array for a pruned user to restore — but after OpenCode compaction removes pruned messages from the array, the search finds nothing and zero-user requests slip through.
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