fix(mm): give the inventory halt headroom for a cNGN rally

[robertleifke]

What I got wrong in #65

MM_MAX_NET_INVENTORY = 650 was sized against the planned funding valued at today's rate. That's the wrong frame: risk.Evaluate measures inventory in the base asset only (USDC), so the worst case — every cNGN rung fills and the whole cNGN balance becomes USDC — is denominated in cNGN and moves with the price.

Funding	@₦1,368	@₦1,300	@₦1,250	@₦1,200
300 USDC + 441,061 cNGN	639	656	670	685

Against a cap of 650, the intended funding halts on roughly a 5% cNGN strengthening — well inside normal movement for this pair. A halt isn't a soft cap: it cancels the entire ladder and the book goes dark until someone notices.

Change

MM_MAX_NET_INVENTORY 650 → 800, which holds the full funding down to about ₦1,150.

Nothing else moves. MM_ORDER_SIZE (40) and MM_MAX_NOTIONAL_PER_SIDE (450,000) are unchanged — they govern quoted depth, and the funding they were sized for is unchanged.

Plan

Plan: 1 to add, 1 to change, 1 to destroy
  # aws_ecs_service.market_maker will be updated in-place
  # aws_ecs_task_definition.market_maker must be replaced
    ~ value = "650" -> "800"

Env-only, no image change, no desired_count, no other resources.

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