manage_experiment

Pause or restart a whole experiment (a launched channel campaign inside a wizard campaign).

                KEYWORDS: pause, stop, restart, resume, unpause, experiment, control, manage, halt

                WHEN TO USE:
                - User asks to "pause experiment X"
                - User wants to "stop the LinkedIn experiment"
                - User requests to "restart experiment Y"
                - User wants to "resume/unpause a paused experiment"

                SCOPE - DO NOT CONFUSE WITH SIMILAR TOOLS:
                - manage_experiment (this tool) acts on ONE WHOLE EXPERIMENT.
                - pause_experiment_keyword / restart_experiment_keyword act on ONE
                  KEYWORD inside an experiment - they never pause the experiment itself.
                - manage_campaign acts on the whole wizard campaign, which can span
                  several experiments/channels.

                ACTIONS:
                - pause: Stop ad serving and budget spend for the experiment
                - restart: Resume a paused experiment so it serves ads and spends again

                WORKFLOW:
                1. Find the experiment: search_experiments(search_name="my experiment")
                   and note experimentId and statusLabel from the results
                2. Pause it: manage_experiment(experiment_id=123, action="pause")
                3. Or restart it: manage_experiment(experiment_id=123, action="restart")

                IMPORTANT VALIDATION REQUIREMENTS:
                - **CRITICAL**: You can ONLY pause experiments that are currently active
                - **CRITICAL**: You can ONLY restart experiments that are currently Paused
                - Use search_experiments first to verify the current experiment status

                RESTART BUDGET CONFIRMATION FLOW:
                Restarting first estimates the impact on budget groups (the same check
                the main UI runs). If any budget group is impacted, the tool does NOT
                restart: it returns status="requires_confirmation" with the impacted
                groups in budgetImpact. Present the impact to the user, and only after
                they explicitly confirm, call again with confirm_budget_impact=true.

                ⚠️ WARNING: This changes the live state of the experiment on the ad channel.
                ⚠️ ASYNC FLOW: The channel-side status change may take a moment to
                propagate. Verify later with search_experiments.