feat(lore): fill lore gaps and standardize tags to English

- Fill empty hub index sections (Zakon Taumaturgow, Sily Specjalne Gaja,
  Wybrancy Herosow) and add missing entries (Nemyo) in npcs.md
- Resolve broken template fields for Nil, Mundus, Tempus, Mistrz Losu,
  Ten Ktory jest Mroczny, Anna Heide, and Narcyza using confirmed canon
- Update Kult Otchlani org page to reflect Nil's motive for culling
  her own cultists
- Add "zaklecia" tag to all 104 spell files
- Translate ~90 Polish frontmatter tags to English vault-wide for
  consistency with the spells/ taxonomy (e.g. otchlan->abyss,
  magia-krwi->blood-magic, szkarlatny-kult->crimson-cult), keeping
  proper nouns (character/place names) and clean up legacy "#tag"
  hashtag-style artifacts left over from old Obsidian inline tags

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

npcs/Nauczyciele/Pelagius Caudex.md

@@ -1,13 +1,13 @@
 ---
 tags:
-  - człowiek
-  - mag
-  - rzemiosło-artefaktów
-  - federacja-sol-3
-  - nauczyciel
+  - human
+  - mage
+  - artifact-crafting
+  - federation-sol-3
+  - teacher
   - npc
-  - siły-specjalne-gaja
-  - wybrańcy-herosów
+  - special-forces-gaia
+  - chosen-heroes
 ---
 
 | **Zdjęcie**             | <img src="../../_assets/npc/pelagius-caudex/pelagius-caudex.png" width="200" alt="pelagius-caudex.png">                                                                                                                                                                         |