Data-integrity fixes: no fabricated prices, correct fees, stand down on coin-flips

[PhantomCapAI]

Summary

Live BankrBot testing surfaced two real problems the skill must prevent:

• On a Polymarket market (Fed decision), BankrBot cited the real market URL but confabulated the price/volume — the price changed between queries, volume was ~20× reality, printed to the cent ($14,823,508.62).
• On a 15-minute BTC up/down market, it manufactured a >4% edge and walked to a confirmable bet, instead of standing down on a coin-flip, and ignored the taker fee those markets carry.

Three SKILL.md rules address it:

1. No stated price/volume/depth without a live fetch — cite the market URL and say "verify live at [URL]"; never print an unverified figure or use false precision.
2. Corrected fee model — short-interval crypto markets (BTC/ETH/SOL/XRP 15-min up/down) carry a taker fee; "fee ≈ 0" is false there and must be subtracted from EV.
3. Stand down on near-efficient / coin-flip markets — 15-min crypto is ~50/50 noise with fees erasing any edge; PolyRobin reports it near-efficient and declines rather than fabricating conviction.

No gate thresholds/values changed. CHANGELOG bumped (behavior change).

Verification

• ./scripts/validate.sh → all pass.
• markdown-link-check → no dead links.

🤖 Generated with Claude Code

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Generated by Claude Code