[VPD-1506] Tokenomics Phase II — Prime revenue reallocation (VIP-680/681)

[Debugger022]

Summary

• VIP-680 (regular): reallocates BNB Chain protocol revenue away from the XVS Vault's direct stream and into Prime — reserve Prime share 20%→40%, liquidation Prime share 0%→20%, XVS Vault direct revenue zeroed. Treasury and Risk Fund unchanged.
• VIP-681 (regular): raises PrimeLiquidityProvider USDT/U distribution speeds to pay out the enlarged pool. Held for proposing after July 1, once VIP-680's larger share has accumulated. Speeds are placeholder pending final budget.
• Implements the on-chain revenue-split portion of the Prime Rewards Redesign; leaderboard/eligibility mechanism is out of scope (separate work).

Changes

VIP-680 — revenue reallocation (vips/vip-680/bscmainnet.ts)

• Single PSR.addOrUpdateDistributionConfigs: XVS_BUYBACK → 0% (both schemas); USDT/U prime buybacks 10%→20% each (reserve) and 0%→10% each (new liquidation rows).
• Deletes the two zeroed XVS rows via removeDistributionConfig to stay clear of the PSR maxLoopsLimit (20) — array returns to 18 rows.

VIP-681 — distribution speed (vips/vip-681/bscmainnet.ts)

• PLP.setTokensDistributionSpeed([USDT, U], [...]) sized from a single PLACEHOLDER_MONTHLY_USD_PER_MARKET constant (TODO: replace with final July budget).

Simulations (simulations/vip-680, simulations/vip-681, + ABIs)

• Pre/post state assertions on per-destination percentages, per-schema 100% invariant, row count, event counts, and speed-vs-max bounds.

Test plan

• npx hardhat test simulations/vip-680/bscmainnet.ts --fork bscmainnet → 14 passing
• npx hardhat test simulations/vip-681/bscmainnet.ts --fork bscmainnet → 8 passing
• Verify XVS_BUYBACK (0x637E…) is the XVS Vault stream: VIP-618 maps XVSVaultConverter → XVS_BUYBACK; live PSR split 20%/20% matches "Current".
• Before proposing VIP-681: recompute speeds from final budget + live prices, and confirm PLP holds U.