_resolve_agent_id() produced identical slugs for same-named profiles
(e.g. two "Baidu" → both "baidu"), causing dropdown selection to
always hit the first match. Add _resolve_all_agent_ids() which runs
the same base resolution but appends _2, _3, … suffixes on collision,
guaranteeing every ID in the returned list is unique.
Applied across all call sites: list_agents, get_agent,
send_questionnaire, _simulation_round_structured_input,
_profiles_summary, and Web Console embedded data. JS template
mirrors the same dedup logic client-side.
105 passed, 0 failed. Provider boundary check passed.
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