60391d0eef
When context.engine selects a plugin engine (e.g. LCM), the host compression threshold — including the Codex gpt-5.5 50% -> 85% autoraise — only configures the built-in ContextCompressor and never reaches the plugin. The autoraise notice still fired, telling the user auto-compaction was raised when nothing actually changed, and the startup context-limit line printed the host percent next to the engine's own threshold_tokens, contradicting itself. - Clear _compression_threshold_autoraised when a plugin engine is selected, suppressing both the CLI startup notice and the gateway turn-1 replay via _compression_warning. - Print the active engine's own threshold_percent in the startup context-limit line so percent and token count agree. - Built-in behavior is preserved, including the fallback path where a configured engine fails to load and the built-in compressor takes over. Fixes #44439