docs: add NIFTY expiry report for 2026-09-01

[kunalrbhatia]

Summary

Automated post-expiry P&L analysis for NIFTY, 01 Sep 2026.

Reported Total P&L: ₹+2,046.85 (PROFIT)
Broker-verified settled P&L (all NIFTY01SEP positions): ₹−1,164.80

Caveat

The automated report whitelists symbols from positions.json, which was
pruned/replaced during the session (manual re-entries + stop-loss closes on
symbols no longer in the file: 24000 CE −6,835, 23950 CE −3,861, 23950 PE +1,745,
24000 PE +4,712 were traded but excluded from the report). The report's P&L is
therefore PARTIAL. Broker-settled truth for the full NIFTY01SEP book is −₹1,164.80
(includes foreign niftyicif legs ~+1,027). Actual smart-api day ≈ −₹2,200 to −₹2,500.

Session notes

• First live day of PR feat: close only breached leg on stoploss #113 (close-breached-leg) + PR fix: remove whole-position MTM stoploss condition #114 (MTM signal removed).
• The MTM signal (removed 14:04) closed legs one-by-one incl. a wrongly-selected
  green 24100 CE (mixed cost-basis bug); PR fix: remove whole-position MTM stoploss condition #114 makes green legs unclosable.
• Kill switch engaged 14:59; position rode to expiry; hedges expired worthless.