v2.6.0 — Marketplace negotiation, protocol rename, protocol fees

[2.6.0] — 2026-05-12 — Marketplace negotiation, protocol rename, and protocol fees

Three coordinated changes:

1. The negotiation half of the chain-canonical agent memory
   marketplace. The REST API at brainctl.org/api/marketplace
   already exposed offer / counter / accept / reject / withdraw;
   this release wires them into brainctl marketplace api so
   agents can drive a full negotiation end-to-end from one CLI.

2. The on-chain memo protocol prefix renamed from
   brndb-marketplace/v1: to brainctl-marketplace/v1: so the
   protocol identifier no longer leaks the not-yet-public
   community-token ticker. Pre-launch cutover; no production
   volume was on chain at the old prefix.

3. brainctl protocol fees on every wallet-signed chain op the CLI
   builds, plus a lowered marketplace settlement fee.

Protocol fees (new)

Every CLI-initiated chain transaction includes a small protocol-fee
transfer to a public treasury wallet. The treasury is intentionally
separate from the dev wallet — the dev wallet remains anti-sniping-
held until the token launch. Defaults (calibrated to SOL ≈ $200):

• --sign --pin-onchain 0.0005 SOL (~$0.10)
• marketplace api list 0.0005 SOL (~$0.10)
• marketplace api offer 0.0005 SOL (~$0.10)
• marketplace api counter 0.0005 SOL (~$0.10)
• marketplace api accept 0.0005 SOL (~$0.10)
• marketplace api reject 0.0005 SOL (~$0.10)
• marketplace api withdraw 0.0005 SOL (~$0.10)
• marketplace api cancel 0.0005 SOL (~$0.10)
• export --sign --mint 0.0025 SOL (~$0.50)
• marketplace api settle 2.5% of trade (replaces 3.5%)
• marketplace JIT mint at settle free (seller already paid 2.5%)
• pure offline export --sign free (no chain interaction)
• devnet free (all ops)

Treasury wallet (hardcoded default):

AYyx94RdL4LpBozqZahQ37Q3ziKEoiGZnypp8h9WwW4D

Env overrides for fees and treasury are in
agentmemory.protocol_fees. The CLI prints a one-line disclosure
to stderr before signing every fee-charging op.

Marketplace settlement fee lowered

MARKETPLACE_FEE_BPS reduced from 350 (3.5%) to 250 (2.5%) on both
the Python client and the brainctl-launch TS indexer. No production
volume was on chain at 350 bps, so the cutover is safe.

Added

• brainctl marketplace api offer <listing> --price-usd N — buyer
  submits an offer. Builds + signs the offer manifest, uploads to
  Arweave, posts the on-chain offer memo, registers with the API. TTL
  capped at 24h per the protocol.
• brainctl marketplace api counter <offer> --price-usd N — either
  side counters; the chain audit trail captures the full thread.
• brainctl marketplace api accept|reject <offer> — seller-side.
• brainctl marketplace api withdraw <offer> — offerer-side.
• brainctl marketplace api offers <listing> — list visible offers
  (auction-mode public, private-mode visible only to seller/offerer).
• New primitives in agentmemory.marketplace:
  build_offer_manifest, build_counter_manifest, manifest_hash,
  MAX_OFFER_TTL_HOURS, plus five new MEMO_*_PREFIX constants and
  formatters. parse_memo extended to parse all five new actions.

Changed

• Protocol memo prefix renamed from brndb-marketplace/v1: to
  brainctl-marketplace/v1: across both the Python client and the
  brainctl-launch indexer/server. The previous prefix was an
  early-design choice that coupled the protocol identifier to the
  not-yet-launched community token ticker; the new name decouples
  them permanently. Touches agentmemory.marketplace.MARKETPLACE_SCHEMA,
  every memo formatter, marketplace_listen.py runtime checks,
  commands/marketplace_cli.py schema strings, and tools/zk_mint.js.
  Since the marketplace just opened (no production volume yet), this
  is a clean cutover — no back-compat parser branch needed.
• Marketplace JIT-mint cNFT branding: name "BRNDB #<hash>" →
  "brainctl memory #<hash>", symbol BRNDB → MEM. Pre-launch
  test mints no longer engrave the ticker into permanent chain
  history.
• tools/README.md smoke-test JSON example: neutralized name/symbol.

Tests

• 11 new round-trip tests for the negotiation memo formatters +
  manifest builders. 67/67 marketplace tests pass.