Security: Update .gitignore to exclude runtime data, sessions, and logs

- Add session files exclusion (core/relay/sessions/)
- Add log directories exclusion (logs/, *-logs/, intake-logs/)
- Add runtime database files exclusion (*.db, *.sqlite*)
- Add temporary files exclusion (.cache/, *.tmp, *.temp)
- Remove previously tracked session and database files from git

These files contain runtime data and should not be version controlled.

.gitignore

@@ -55,3 +55,29 @@ models/
 # =============================
 node_modules/
 core/relay/node_modules/
+
+# =============================
+# 💬 Runtime data & sessions
+# =============================
+# Session files (contain user conversation data)
+core/relay/sessions/
+**/sessions/
+*.jsonl
+
+# Log directories
+logs/
+**/logs/
+*-logs/
+intake-logs/
+
+# Database files (generated at runtime)
+*.db
+*.sqlite
+*.sqlite3
+neomem_history/
+**/neomem_history/
+
+# Temporary and cache files
+.cache/
+*.tmp
+*.temp