* chore(pumpswap+docs): post-2026-04-28-cutover PumpSwap unlock + IDL docs
Drops the `INCLUDE_BREAKING_FEE_ACCOUNTS = False` gate in the PumpSwap
learning examples so the +2 breaking-fee accounts (fee recipient
readonly + its quote-mint ATA mutable) are always appended after
`pool-v2`. Mainnet pump-amm rejects this format pre-cutover (verified
6023 Overflow), so this PR is intentionally **draft until 2026-04-28
16:00 UTC** when the cutover happens; mark it ready-for-review and live-
test then.
Also captures the protocol gotchas we learned during this migration:
- README: a new "2026-04-28 program upgrade" section + an explicit note
that the vendored IDL is incomplete (missing `bonding-curve-v2` and
`pool-v2` PDAs that the on-chain program actually requires) with
pointers to cross-check against on-chain txs.
- CLAUDE.md: a new "Pump.fun protocol notes" subsection summarising
the same gotchas plus the BC/Pool/CreateEvent layout details and the
extreme_fast_mode gotcha.
Open question (call out at review time, resolve post-cutover):
- BREAKING_FEE_RECIPIENT.md shows PumpSwap cashback account counts of
27 buy / 26 sell vs 26 / 24 non-cashback — the extra cashback account
seed/position isn't documented. Need to sample a real successful
cashback PumpSwap tx after cutover and add the branch.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* feat(pumpswap): wire cashback layout for post-2026-04-28 program upgrade
Cashback PumpSwap pools require extra writable accounts inserted before
pool-v2. Identified layouts by sampling on-chain post-cutover txs:
- buy: insert user_volume_accumulator_quote_ata (27 accounts vs 26)
ref tx 4JaWdExj…fvjK
- sell: insert user_volume_accumulator_quote_ata + user_volume_accumulator
(26 accounts vs 24)
ref tx 4ei1cJV7…NP3
Detect via pool account byte 244 (is_cashback_coin). Adds the standalone
sample_cashback_pumpswap.py used to reverse-engineer the layouts.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---------
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Anton Sauchyk