v0.1.7

surge-dispatch polish release: end-to-end shadow prices, Q-LMPs,
faster N-1 screening, and SCUC correctness fixes. New in-process
Rust→Python tracing broadcast on surge-py. GO C3 defaults updated.

Added (surge-dispatch)

• Per-branch and per-contingency shadow prices flow from AC SCED
  through to BranchThermal constraint results; security-loop
  flowgates retain their N1_t{period}_… names. SCUC pricing
  extraction emits per-constraint duals whenever the dual vector is
  full-length, while LMPs still gate on optimal pricing-LP status.
• Per-bus Q-LMP on AC SCED dispatch results.
• Per-iteration security SCUC timings in run-report.json.
• Optional per-iteration scalar loss-feedback pass in SCUC.

Added (surge-py)

• In-process Rust→Python tracing broadcast (replaces fd-tee, which
  deadlocked under load); typed .pyi stubs.

Fixed

• surge-dispatch: PTDF-form security cuts now bind dispatch when
  scuc_disable_bus_power_balance=true (previously absorbed by free
  per-bus slacks).
• surge-dispatch: AC SCED no-storage path now threads dt_hours
  (was hard-coded to 1 h, miscosting sub-hourly markets).
• surge-dispatch: SCUC PF system-row RHS sign — drop the loss
  double-count that hung AC SCED on loss-feedback runs.
• surge-dispatch: sparse-aware reserve extraction preserves
  storage SoC coupling across the SCUC/SCED handoff.
• surge-dispatch: zonal / system reserve duals preserved through
  the pricing LP so AS clearing prices match.
• surge-opf: AC-OPF Ipopt constr_viol_tol bound to tol so
  unscaled bus balance tracks the requested tolerance.

Performance (surge-dispatch)

• ~45–65× faster N-1 security screening: per-period parallelism via
  rayon and flat per-branch state in HourlySecurityContext
  remove the inner-loop HashMap rebuild on 6049-bus and larger.
• 16× sparser PTDF security cuts on the
  scuc_disable_bus_power_balance path: active-period gating moved
  above PTDF row construction, bus_load_p_mw_with_map hoisted out
  of the per-row loop, per-row HashMap allocation eliminated.
  617-bus D1 SCUC: 118 M NZ / 20.9 s → ~7 M / sub-second.

Changed

• GO C3 exporter: consumer reserve shedding
  (ExportOptions::allow_consumer_reserve_shedding, default on)
  caps per-consumer up/down reserve awards to the available room
  after ac_dispatch curtailment, fixing spurious validator
  viol_cs_t_p_on_* flags on physically valid solutions.
• GO C3 defaults: scuc_loss_treatment="scalar_feedback" (was
  static), scuc_security_preseed_count_per_period=0 (was 1000).

Build

• Dashboard Docker image installs zstandard for compressed
  network blob round-trips.

Dashboards (dashboards/rto, dashboards/battery) saw substantial
work this cycle but are not part of the published release surface.