- Remove duplicate write_index, get_base_session_id, get_pm_agent_session_id,
get_session_for_issue, set_base_in_index, set_pm_agent_in_index,
add_issue_to_index, remove_issue_from_index from kugetsu
- These functions are already defined in kugetsu-index.sh which is sourced earlier
- The kugetsu versions were shadowing the kugetsu-index.sh ones unnecessarily
- This removes code duplication and ensures consistent behavior
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