fix(content): final-review polish — link the-seven roster + roadmap wording

- faction.the-seven now relates down to all seven lords (spec §4 intent;
  bidirectional discoverability), regenerated the-seven.json.
- canon-roadmap: clarify Bloodsworn resolves the warlock's former [CANON-TBD] name.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HuHRPE7VfppUJEaoGBEUqZ

content/world/canon/the-seven.json

@@ -4,7 +4,14 @@
   "related": [
     "person.the-warden",
     "rule.blood-price",
-    "rule.possession"
+    "rule.possession",
+    "person.kareth-the-red-king",
+    "person.vael-the-quiet-knife",
+    "person.morren-the-grey-mother",
+    "person.ghaul-the-yoke",
+    "person.ishri-the-open-mouth",
+    "person.nuun-the-hollow-choir",
+    "person.draeth-the-crowned-worm"
   ],
   "type": "faction"
 }