chore: spin off Pokémon ROM-hack material to standalone repo

The Pokémon catalog + pipeline are moved out of this infra repo. The catalog
notes now live in the self-hosted Obsidian vault (Pokémon ROM Hacks/); the
acquisition/patching scripts live in their own repo at Documents\pokemon.
homelabstack stays focused on the homelab.

- rm pokemon-romhack-vault/ (75 hack notes + Index/Types/README/Platforms)
- rm scripts/{build-romhack-vault,romhack-import,romhack-fetch,romhack-apply}.py
- rm pokemon-romhacks-wanted.md
- .gitignore: drop the now-dead pokemon/ drop-folder rule
- .claude/skills/vault/SKILL.md: condense the Pokemon-vault subtree to a one-line pointer

RomM stack (stacks/roms) and the general igir library scripts stay.

.claude/skills/vault/SKILL.md

@@ -81,13 +81,8 @@ claude/
   Monitoring.md    — Uptime Kuma v2 socket technique
   Vault.md         — this stack's infrastructure, MCP access
 testing.md         — original connectivity test note
-Pokémon ROM Hacks/
-  _Claude.md       — ROM hack vault ops: schema, update patterns, new-hack checklist
-  Index.md         — all 75 hacks directory (Dataview + static)
-  Play Queue.md    — play tracking dashboard
-  Hacks/           — 75 notes, one per hack
-  Bases/           — per-base MOCs (FireRed / Emerald / Crystal / Ruby / NDS)
-  Platforms/       — per-system MOCs (GBA / GBC / GB / NDS)
+Pokémon ROM Hacks/   — Pokémon romhack KB in the live vault; catalog + build
+                       scripts live in the standalone Documents\pokemon repo
 ```
 
 ## Load tool schemas (if deferred)