chore: remove home/ from git, update gitignore

All user persona data (memory, tasks, crons, identity files, sessions)
was previously committed. This removes it from tracking and adds home/
to .gitignore — files remain on disk and will continue to sync via
Syncthing. Backup should be handled via encrypted per-user means.

Also added: cortex/.env*.bak and cortex/=* (pip artifact) to gitignore.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -3,27 +3,27 @@
 __pycache__/
 *.pyc
 
-# Secrets — keep .env.example, never commit real .env
+# Secrets — keep .env.default, never commit real .env
 .env
+cortex/.env*.bak
 
-# Session data (runtime state, not source)
+# Pip install artifacts
+cortex/=*
+
+# Runtime data
 cortex/data/
-home/**/session_data/
-home/**/sessions/
 
-# User credentials and tokens — never commit
-home/**/auth.json
-home/**/invite.json
-home/**/profile.json
-home/**/channels.json
+# User home directory — all persona data, memory, tasks, and credentials
+# are personal and must never be committed. Back up via encrypted means.
+home/
 
-# Syncthing Metadata
+# Syncthing metadata
 .stfolder/
 
-# Temporary Files
+# Temporary files
 tmp/
 *.tmp
 *.log
 
-# System Files
+# System files
 .DS_Store