v0.1.9 — Datacenter Operator market + SCUC primitives

New Datacenter Operator market — behind-the-meter SCUC for a
microgridded datacenter — and three SCUC primitives that support it.

Added (markets, dashboards)

• markets/datacenter/ + dashboards/datacenter/: optimises
  commitment + dispatch + AS awards across IT-load tiers (must-serve +
  curtailable VOLL), BESS, solar, wind, fuel cell, gas CT, diesel,
  optional must-run nuclear, and (optional) coincident-peak
  transmission charges, against an exogenous LMP forecast and AS price
  forecasts. Forecasts and asset specs editable live; re-solves in
  seconds.

Added (surge-dispatch)

• peak_demand_charges: SCUC primitive for coincident-peak demand
  charges (e.g. ERCOT 4-CP). Adds an auxiliary peak_mw variable
  bounded below by the resource's dispatch on the flagged periods,
  with a linear charge_per_mw × peak_mw objective term.

Added (surge.market)

• generator_dispatch_bounds: pin a resource's per-period dispatch
  window directly in MW (set p_min == p_max for must-take fixed
  output).
• must_run_units: force u[t]=1 for the listed resources. Paired
  with generator_dispatch_bounds this removes both commitment and
  dispatch freedom — the canonical pin for baseload nuclear /
  must-take PPAs / fixed-output IPP contracts.
• ECRS canonical reserve product.

Changed (defaults)

• markets.go_c3 default lp_solver flipped from gurobi → highs.
  Default runs no longer require a commercial license.