v3.18.0

Changed

• The public PyPI wheel is now core-only (open-core re-slice per the
  2026-07-16 packaging decisions). The production server surface
  (REST/gRPC server, proxy, routers, middleware), the advanced-accuracy
  set (verified_scorer, sharded_nli, cross-model consensus,
  forecasting, calibration), evaluation, training/fine-tuning and the
  enterprise packages now ship only in the commercial
  director-ai-pro / director-ai-full wheels (BUSL-1.1), installed
  from the private index at pypi.remanentia.com. Public names remain
  importable in a core-only install and raise a friendly
  "requires the advanced tier" error when used; the free streaming
  halt, 5-tier scorer, RAG grounding, CLI verification surface and
  integrations are unchanged.
• The sdist mirrors the same boundary and carries the build shims, so a
  wheel built from the sdist applies identical slicing.
• Docker images (CPU + GPU) now compose the free core wheel with the
  director-ai-pro overlay, matching their pre-slice content — the
  server image has always carried the BUSL production surface.
• Paid wheels declare director-ai>=3.18.0,<4: the slimmed core is a
  file-level prerequisite for overlaying the pro/full modules.

Added

• scripts/check_free_wheel.py — CI contents check plus an
  unpacked-wheel import simulation proving the free wheel imports
  standalone with friendly tier boundaries; the public publish lane
  refuses paid-tier artefacts (dependency-confusion gate) and the paid
  lane uploads to the private index.
• packages/paid_tier_manifest.json + packages/tier_build_hooks.py —
  the shared record of paid single modules consumed by the build hooks,
  wheel checks and the packaging parity test suite.