chore: remove legacy deployment files and update gitignore

- Removed .deployment_progress tracking file
- Removed .last_backup tracking file
- Removed AITBC1_TEST_COMMANDS.md and AITBC1_UPDATED_COMMANDS.md documentation
- Updated .gitignore for project reorganization (project-config/, docs/, security/, backup-config/)
- Enhanced .gitignore patterns for __pycache__, backups, and monitoring files
- Aligned gitignore with new directory structure from project reorganization

scripts/monitoring/nightly_health_check.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 #
 # AITBC Nightly Health Check
-# Runs master planning cleanup and reports documentation/planning cleanliness.
+# Runs master planning cleanup and reports docs/planning cleanliness.
 #
 set -e
 
@@ -30,7 +30,7 @@ else
   log_warn "Master workflow script not found or not executable: $MASTER_WORKFLOW"
 fi
 
-log_info "Collecting documentation/planning stats..."
+log_info "Collecting docs/planning stats..."
 planning_files=$(find "$PLANNING_DIR" -name "*.md" | wc -l)
 completed_files=$(find "$DOCS_DIR/completed" -name "*.md" | wc -l)
 archive_files=$(find "$DOCS_DIR/archive" -name "*.md" | wc -l)