fix(context_compressor): always keep last user message in tail to prevent active-task loss#11052
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…vent active-task loss Ensure _align_boundary_backward never pushes the last user message into the compressed region. Without this, compression could delete the user active task instruction mid-session. Cherry-picked from #10969 by @sontianye. Fixes #10896.
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Cherry-picked from #10969 by @sontianye. Fixes #10896.
Ensure
_align_boundary_backwardnever pushes the last user message into the compressed region. Without this, compression could delete the user's active task instruction mid-session.Test Results