Fix update-agent-context.sh to handle files without Active Technologies/Recent Changes sections

- Add section detection logic to check if required sections exist
- Automatically append missing sections at end of file if they don't exist
- Preserve existing manually-created content in agent files
- Fix bash syntax errors in grep command handling
- Improve robustness for files that don't follow template structure

This fixes an issue where the script would silently fail to update agent files
like CLAUDE.md that were manually created with different section structures.

Author: valdezm

scripts/bash/update-agent-context.sh

@@ -388,12 +388,25 @@ update_existing_agent_file() {
         new_change_entry="- $CURRENT_BRANCH: Added $NEW_DB"
     fi
 
+    # Check if sections exist in the file
+    local has_active_technologies=0
+    local has_recent_changes=0
+    
+    if grep -q "^## Active Technologies" "$target_file" 2>/dev/null; then
+        has_active_technologies=1
+    fi
+    
+    if grep -q "^## Recent Changes" "$target_file" 2>/dev/null; then
+        has_recent_changes=1
+    fi
+    
     # Process file line by line
     local in_tech_section=false
     local in_changes_section=false
     local tech_entries_added=false
     local changes_entries_added=false
     local existing_changes_count=0
+    local file_ended=false
 
     while IFS= read -r line || [[ -n "$line" ]]; do
         # Handle Active Technologies section
@@ -454,6 +467,22 @@ update_existing_agent_file() {
     # Post-loop check: if we're still in the Active Technologies section and haven't added new entries
     if [[ $in_tech_section == true ]] && [[ $tech_entries_added == false ]] && [[ ${#new_tech_entries[@]} -gt 0 ]]; then
         printf '%s\n' "${new_tech_entries[@]}" >> "$temp_file"
+        tech_entries_added=true
+    fi
+    
+    # If sections don't exist, add them at the end of the file
+    if [[ $has_active_technologies -eq 0 ]] && [[ ${#new_tech_entries[@]} -gt 0 ]]; then
+        echo "" >> "$temp_file"
+        echo "## Active Technologies" >> "$temp_file"
+        printf '%s\n' "${new_tech_entries[@]}" >> "$temp_file"
+        tech_entries_added=true
+    fi
+    
+    if [[ $has_recent_changes -eq 0 ]] && [[ -n "$new_change_entry" ]]; then
+        echo "" >> "$temp_file"
+        echo "## Recent Changes" >> "$temp_file"
+        echo "$new_change_entry" >> "$temp_file"
+        changes_entries_added=true
     fi
 
     # Move temp file to target atomically