mcp proposal · package #68

The Hihn Confluence — new Silgolt riverland country (spatial-only)

Grounded on map/spatial countries.json (country feature Hihn, id 5), rivers.json (river family Hihn, Hihnso, Hihnsi, Hihnsokek, Hihnzo, Hihnzoly), adjacency.json (Hihn adjacency record), and spatial-brief.md sections for Tovo Duchy, Aalhotikyn Duchy, Ohynso Duchy, Namuzdus Dominion, Siltuz Federation, Súzyngol Federation, Tuzraag Duchy, Ygtaani Duchy, Okâzjuní Union (all reference Hihn). Canon contrast and context: countries_and_continents.continents.silgolt.nations.revakgol.empire_of_revakgol, countries_and_continents.continents.silgolt, history.events.the_twin_pyres_schism, history.events.revakgol_imperial_peak_and_cultural_decay. Species names from Silgolt context (Zegtuzsos, Yukejulhel, Kaetijulhel, Saarotsos). No prior canon entity or candidate package exists for Hihn. Structural sibling: package 66 (Izheim Union).