feat(roms): add Obsidian vault knowledge base for 75 library romhacks

build-romhack-vault.py generates pokemon-romhack-vault/: one note per hack
(YAML properties + tags + summary + links), an Index MOC (Dataview + static
table), a Types taxonomy, and per-platform MOCs. Dataset is the single source
of truth — edit + re-run to extend.

pokemon-romhack-vault/Hacks/Modern Emerald.md

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+---
+title: "Pokémon Modern Emerald"
+platform: GBA
+base: "Emerald"
+version: "3.3.1"
+status: "Complete"
+type: ["Vanilla+", "QoL", "Expansion"]
+generation: "Multi-gen"
+library_path: "roms/gba/Hacks/Pokemon - Modern Emerald (Hack).gba"
+source: "https://www.hackdex.app/hack/modern-emerald"
+added: 2026-06-06
+tags: ["hack", "platform/gba", "base/emerald", "status/complete", "type/vanilla+", "type/qol", "type/expansion"]
+---
+# Pokémon Modern Emerald
+
+> [!info] Vanilla+ · QoL · Expansion — **Complete**
+> Game Boy Advance · base **Emerald** · version **3.3.1** · Multi-gen
+
+## Summary
+Emerald modernized end-to-end — all gens, modern mechanics, and a deep QoL/settings menu, while keeping Hoenn's story.
+
+## Type
+[[Types#Vanilla+|Vanilla+]] [[Types#QoL|QoL]] [[Types#Expansion|Expansion]]
+
+## Links
+- Source / info: https://www.hackdex.app/hack/modern-emerald
+- Lookup: https://duckduckgo.com/?q=Pok%C3%A9mon%20Modern%20Emerald%20rom%20hack
+
+## In the library
+- `roms/gba/Hacks/Pokemon - Modern Emerald (Hack).gba` on valhalla
+- Patch/source artifact archived under `/storage1/igir/romhacks/patches/`
+
+[[Index|← back to directory]]