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/Theta Emerald EX.md

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+---
+title: "Pokémon Theta Emerald EX"
+platform: GBA
+base: "Emerald"
+version: "EX"
+status: "Complete"
+type: ["Expansion", "Vanilla+"]
+generation: "Gen 1–6 mons"
+library_path: "roms/gba/Hacks/Pokemon - Theta Emerald EX (Hack).gba"
+source: "https://www.pokecommunity.com/threads/pokemon-theta-emerald-ex.366617/"
+added: 2026-06-06
+tags: ["hack", "platform/gba", "base/emerald", "status/complete", "type/expansion", "type/vanilla+"]
+---
+# Pokémon Theta Emerald EX
+
+> [!info] Expansion · Vanilla+ — **Complete**
+> Game Boy Advance · base **Emerald** · version **EX** · Gen 1–6 mons
+
+## Summary
+Classic 'all 800+ mons in Emerald' hack — Megas, Fairy type, and the full dex obtainable within Hoenn's story.
+
+## Type
+[[Types#Expansion|Expansion]] [[Types#Vanilla+|Vanilla+]]
+
+## Links
+- Source / info: https://www.pokecommunity.com/threads/pokemon-theta-emerald-ex.366617/
+- Lookup: https://duckduckgo.com/?q=Pok%C3%A9mon%20Theta%20Emerald%20EX%20rom%20hack
+
+## In the library
+- `roms/gba/Hacks/Pokemon - Theta Emerald EX (Hack).gba` on valhalla
+- Patch/source artifact archived under `/storage1/igir/romhacks/patches/`
+
+[[Index|← back to directory]]