[vieneny]

Operator turns that return no tool calls, or consume the tool budget with helper work, can repeat without producing an executable decision. Add pro.execution.max_no_action_turns (default 4, range 1–20) to bound consecutive turns without an action or a completed plan. Ordinary assistant replies are preserved in the transcript so their feedback is available when the run stops.

The counter resets after an executable action or completion of the plan. Continuous plans require a user stop to take the completion exemption. Reaching the limit raises OperatorNoActionLimitError with the fixed reason operator_no_action_limit.

Validation:

• 134 related Operator, plan, and configuration tests passed.
• Repository Ruff format/check, quality ratchet, and protected-core Pyright passed.
• The broader deterministic pytest run reached roughly 84% before its 150-second time limit, with four failure markers and no final summary. All four failures were reproduced on the unchanged upstream baseline (351ca842): readiness cache refresh, Windows platform paths, and the two CLI restart tests. Full-suite validation remains incomplete; this PR is a draft.

No device or external model calls were used for this validation.

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