─── scenario: position-buildup ────────────────────────────────────
HEADLINE ✓: Two market buys, 10@100 then 10@110, leave Alice long 20 contracts at avg_entry 105 — VWAP via the clearing layer.

DESCRIPTION:
  A single trader builds a long position over two market buys at different prices, demonstrating the clearing layer's VWAP-style `avg_entry` computation. Alice first buys 10 contracts at 100 (avg_entry = 100), then buys another 10 at 110 (avg_entry weighted to 105). The maker takes the matching short side at the same VWAP. Useful for asking: how does the engine track entry price across multiple fills? What is the unrealized P&L baseline an account is compared against?
  
  Final mark settles back to 100 via a small mark-book so the scenario doesn't trigger liquidations — this is a `walkthrough`, not stress.

TIMELINE (per-block):
  height  mark    src              trades  fills  deposits  liqs  adl  fund
  ------  ------  ---------------  ------  -----  --------  ----  ---  ----
       1     100  stub-empty-book       1      0         2     0    —     —
       2     100  stub-empty-book       1      1         0     0    —     —
       3     100  stub-empty-book       1      0         0     0    —     —
       4     100  stub-empty-book       1      1         0     0    —     —
       5     100  clob                  2      0         0     0    —     —

ACCOUNT DELTA (final − initial):
  account  collateral  position  avg_entry
  -------  ----------  --------  ---------
       10        5000        20        105
      100        5000       -20        105
  (initial account count: 0, final account count: 2)

OUTCOMES:
  ✓ Exactly 2 accounts touched by trades (Alice + maker)
  ✓ Exactly two fills (the two staged market buys)
  ✓ No surprise fills beyond the two buys
  ✓ Alice's collateral covers her position; zero liquidation scan-hits (this is a walkthrough, not stress)
  ✓ Alice ends with +20 long after both market buys
  ✓ Alice's avg_entry is the VWAP of the two fills: (10×100 + 10×110) / 20 = 105
  ✓ Maker ends with the matching -20 short at the same VWAP
  ✓ Maker's avg_entry is symmetrically the same VWAP of 105

  8 of 8 outcome(s) verified.

NOTE: v1 runs the scenario in-process against a unit-provider
`LiveRethEvmBridge<()>` (no Reth boot). For the production-shape
run (real Reth + Malachite + JSON-RPC), use:
  openhl reth-devnet --chain-history scenarios/position-buildup.json --rounds 5

NEXT:
  • Adopt this engine  : https://github.com/psyto/rdk
  • Custom build       : https://fabrknt.com/waitlist.html?product=evm-perp&intent=build
  • Hosted access      : https://fabrknt.com/waitlist.html?product=evm-perp&intent=hosted