feat(regulatory-map): customer-readable read-model over the scope (step 4)

The Map Renderer explains the engine's state, it does not extend it. Pure
composition of resolve_product_scope (scope verdict) + derive_obligations
(registry-linked obligations + overlaps) into one RegulatoryMap.

- product_summary, trigger_facts, applicable/uncertain/excluded regulations,
  unsupported_domains, overlaps (shared_obligations), shared_evidence, and a
  customer-readable executive_summary.
- No own legal decisions: applicable/uncertain mirror the scope verdict exactly.
- Obligations shown ONLY when registry-linkable (registry_anchor) — MaschinenVO/
  EMV obligations are proposed, so they render empty + a note, never as linked.
  Overlaps/shared_evidence likewise filtered to registry-linked members.
- Uncertain regulations link to the navigator question that would resolve them
  (RED -> has_radio_module, DataAct -> generates_usage_data).
- Environmental appears only as unsupported_domain; executive_summary has NO
  percentage (counts + "no further regulations identified" instead).
- POST /reasoning/regulatory-map (thin handler). Response types are presentation-
  level, not meta-model classes (freeze v1.0 untouched).
- 9 tests; 56 green (existing reasoning MVP stays green), mypy clean, LOC ok.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend-compliance/compliance/regulatory_map/__init__.py

@@ -0,0 +1,31 @@
+"""Regulatory Map — customer-readable read-model over the engine's scope output.
+
+Composes scope + registry-linked obligations + overlaps into one map:
+product -> trigger facts -> applicable / uncertain / excluded regulations ->
+obligations -> overlaps -> unsupported domains -> executive summary. Explains the
+engine's state, never extends it. No new logic, no UI, no RAG, no percentage.
+"""
+
+from __future__ import annotations
+
+from .renderer import render_regulatory_map
+from .schemas import (
+    ApplicableRegulationView,
+    ExcludedRegulationView,
+    ObligationRef,
+    OverlapView,
+    RegulatoryMap,
+    RegulatoryMapRequest,
+    UncertainRegulationView,
+)
+
+__all__ = [
+    "render_regulatory_map",
+    "RegulatoryMap",
+    "RegulatoryMapRequest",
+    "ApplicableRegulationView",
+    "UncertainRegulationView",
+    "ExcludedRegulationView",
+    "OverlapView",
+    "ObligationRef",
+]