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/Polished Crystal.md

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+---
+title: "Pokémon Polished Crystal"
+platform: GBC
+base: "Crystal"
+version: "3.2.3"
+status: "Complete"
+type: ["Vanilla+", "QoL", "Expansion"]
+generation: "Gen 1–7 mons"
+library_path: "roms/gbc/Hacks/Pokemon - Polished Crystal (Hack).gbc"
+source: "https://github.com/Rangi42/polishedcrystal"
+added: 2026-06-06
+tags: ["hack", "platform/gbc", "base/crystal", "status/complete", "type/vanilla+", "type/qol", "type/expansion"]
+---
+# Pokémon Polished Crystal
+
+> [!info] Vanilla+ · QoL · Expansion — **Complete**
+> Game Boy Color · base **Crystal** · version **3.2.3** · Gen 1–7 mons
+
+## Summary
+The gold standard Crystal enhancement: physical/special split, ~Gen 7 movesets/species availability, faithful or modern modes, tons of QoL. Open-source decomp.
+
+## Type
+[[Types#Vanilla+|Vanilla+]] [[Types#QoL|QoL]] [[Types#Expansion|Expansion]]
+
+## Links
+- Source / info: https://github.com/Rangi42/polishedcrystal
+- Lookup: https://duckduckgo.com/?q=Pok%C3%A9mon%20Polished%20Crystal%20rom%20hack
+
+## In the library
+- `roms/gbc/Hacks/Pokemon - Polished Crystal (Hack).gbc` on valhalla
+- Patch/source artifact archived under `/storage1/igir/romhacks/patches/`
+
+[[Index|← back to directory]]