fix(cortex): align KNOWLEDGE_CATEGORIES with current schema.md

The hardcoded category list still used the old taxonomy (entities,
concepts, summaries, how-to), but the live schema documented in
skills/cortex/schema.md uses people/ventures/topics/synthesis/
decisions/learning/research.

Result: status, rebuild-index, and setup all ignored the real store
contents, reporting tiny page counts (e.g. 21) for stores with
hundreds of valid pages because they only counted directories that
no longer match the schema.

Changes:
- KNOWLEDGE_CATEGORIES now matches schema.md
- MEMORY.md routing template links to people/ instead of entities/
- EXTRA_DIRECTORIES drops duplicate 'learning' (now in main list)

Verified against a live store: 366 pages now counted correctly
across all 7 schema categories.

Co-Authored-By: Bosun <bosun@carmenta.ai>

Author: 2 people

skills/cortex/cortex

@@ -55,10 +55,11 @@ SENSITIVE_EXTENSIONS = {".pem", ".key", ".p12", ".pfx", ".jks", ".keystore", ".k
 SENSITIVE_PREFIXES = ("secret", "credentials", ".env", "id_rsa", "id_ed25519", "id_ecdsa")
 
 KNOWLEDGE_CATEGORIES = [
-    "entities", "concepts", "summaries", "synthesis", "decisions", "how-to",
+    "people", "ventures", "topics", "synthesis", "decisions",
+    "learning", "research",
 ]
 
-EXTRA_DIRECTORIES = ["learning", "learning/archive", "daily"]
+EXTRA_DIRECTORIES = ["learning/archive", "daily"]
 
 CONFIG_DIR = Path.home() / ".config" / "cortex"
 CONFIG_FILE = CONFIG_DIR / "config"
@@ -464,7 +465,7 @@ def _setup_symlink(store_path: Path) -> bool:
             "# Memory Index\n\n"
             "## Quick Links\n"
             "- [Knowledge Base Index](Knowledge Base/index.md)\n"
-            "- [All Entities](Knowledge Base/entities/index.md)\n"
+            "- [All People](Knowledge Base/people/index.md)\n"
             "- [Recent Decisions](Knowledge Base/decisions/index.md)\n"
         )
         print("Created MEMORY.md routing table")