Normandy.Behaviours.Compactor.WindowManager
(normandy v1.1.1)
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Opt-in Compactor that wraps Normandy.Context.WindowManager's truncation
strategies (:oldest_first | :sliding_window | :summarize).
Triggered at the turn's :steering boundary: builds a WindowManager whose
max_tokens is the model's context window (from ctx.window, unless opts
pins an explicit :max_tokens), then delegates to
WindowManager.ensure_within_limit/2 — a no-op when already under budget.
opts flow straight to WindowManager.new/1 (:strategy, :reserved_tokens,
:max_tokens). The :summarize strategy needs acc.client; if summarization
fails it returns the original acc with %{compacted: false, error: reason}
rather than crashing the turn.