_try_execute_sip_paper and _try_execute_sip_live were hardcoding
NIFTYBEES.NS regardless of strategy. Added equity_symbol/gold_symbol
params to try_execute_sip and propagated from runner using _EQUITY_SYM
(_GOLD_SYM). Also fixed JUNIORBEES check in state accounting helpers.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>