feat(content): author 124 notable brand corps across 8 categories (#828)

Adds brands.toml with 124 brand_products entries (plus halo/volume pairs
and brand_inputs) covering all 8 D-189 categories: terroir, heritage_craft,
tech_premium, cultural, service_premium, commodity_branded, design_heritage,
platform_catalogue. Includes 112 new wiki/corporations stub pages for FK
integrity. Brand layer validation V-B01–V-B06 passes; Phase 2 coverage gate
failures are pre-existing raw-commodity gaps (out of scope for #828).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

wiki/corporations/rheingold-distillers.md

@@ -0,0 +1,24 @@
+---
+title: "Rheingold Distillers"
+description: "Rheingold Distillers — regional specialty producer based in Rødvik, west reach"
+slug: rheingold-distillers
+category: corporation
+status: canonical
+created: 2026-04-19
+updated: 2026-04-19
+scope: regional
+faction_type: economic
+headquarters: Rødvik (GJ 581)
+tags: [terroir, west_reach, mark, scarcity_class_rare]
+decision_refs: [D-189]
+cross_refs: []
+---
+
+# Rheingold Distillers
+
+**Type:** Corporation — Regional Specialty Producer
+**Status:** Canonical
+**Scope:** Regional — west reach operations
+**Headquarters:** Rødvik (GJ 581)
+
+Rheingold Distillers is a regional specialty producer operating out of Rødvik (GJ 581). Details to be expanded.