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/Emerald Kaizo.md

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+---
+title: "Pokémon Emerald Kaizo"
+platform: GBA
+base: "Emerald"
+version: "—"
+status: "Complete"
+type: ["Difficulty"]
+generation: "Gen 3"
+library_path: "roms/gba/Hacks/Pokemon - Emerald Kaizo (Hack).gba"
+source: "https://duckduckgo.com/?q=Pok%C3%A9mon%20Emerald%20Kaizo%20rom%20hack"
+added: 2026-06-06
+tags: ["hack", "platform/gba", "base/emerald", "status/complete", "type/difficulty"]
+---
+# Pokémon Emerald Kaizo
+
+> [!info] Difficulty — **Complete**
+> Game Boy Advance · base **Emerald** · version **—** · Gen 3
+
+## Summary
+The classic Emerald kaizo — every gym/E4 team is maxed-out and merciless.
+
+## Type
+[[Types#Difficulty|Difficulty]]
+
+## Links
+- Source: _(not catalogued — see lookup)_
+- Lookup: https://duckduckgo.com/?q=Pok%C3%A9mon%20Emerald%20Kaizo%20rom%20hack
+
+## In the library
+- `roms/gba/Hacks/Pokemon - Emerald Kaizo (Hack).gba` on valhalla
+- Patch/source artifact archived under `/storage1/igir/romhacks/patches/`
+
+[[Index|← back to directory]]