Update Cursor rules: add gitkeep handling, update gitignore guidance, and fill empty rule files

.cursor/rules/ci-pipeline.mdc

@@ -1,5 +0,0 @@
----
-description:
-globs:
-alwaysApply: false
----

.cursor/rules/gitignore.mdc

@@ -3,3 +3,36 @@ description:
 globs: 
 alwaysApply: false
 ---
+# Gitignore Rules
+
+The [.gitignore](mdc:.gitignore) file controls which files are tracked by Git.
+
+## Key Patterns
+
+- Cruft files (temporary/generated files) should always be ignored
+- The `./temp` directory should exist in the repository
+- Contents of `./temp` should be ignored (except for `.gitkeep`)
+
+## Standard Cruft Files to Ignore
+
+- `*.log` - Log files
+- `*.tmp`, `*.bak` - Temporary and backup files
+- `*.swp`, `*.swo` - Vim swap files
+- `*.pyc`, `__pycache__/` - Python bytecode
+- `node_modules/` - Node.js dependencies
+- `dist/`, `build/` - Build output directories
+- `*.DS_Store`, `Thumbs.db` - OS-specific files
+
+## Temp Directory Setup
+
+```gitignore
+# Allow temp directory but ignore its contents
+./temp/*
+!./temp/.gitkeep
+```
+
+## Important Guidelines
+
+- When adding files to a previously empty directory with a `.gitkeep`, remove the `.gitkeep` file
+- Never commit sensitive data, temporary build artifacts, or large binary files
+- Keep the temp directory clean by only using it for local testing

.cursor/rules/gitkeep-handling.mdc

@@ -0,0 +1,47 @@
+---
+description: 
+globs: 
+alwaysApply: false
+---
+# .gitkeep File Handling
+
+## Purpose of .gitkeep
+
+The `.gitkeep` file is a convention (not a Git feature) used to:
+- Track otherwise empty directories in Git
+- Ensure important directory structures are maintained
+- Placeholder for directories that will contain files in the future
+
+## Important Rule
+
+**When adding content to a directory that contains a `.gitkeep` file, you should delete the `.gitkeep` file.**
+
+```bash
+# Example workflow when adding content to a previously empty directory
+# 1. Check if .gitkeep exists
+if [ -f directory/.gitkeep ]; then
+    # 2. Remove it when adding actual content
+    rm directory/.gitkeep
+fi
+
+# 3. Add your files
+touch directory/your-new-file.txt
+
+# 4. Commit both changes together
+git add directory/
+git commit -m "Add content to directory and remove .gitkeep"
+```
+
+## Why Remove .gitkeep?
+
+- `.gitkeep` serves no purpose once a directory contains files
+- Leaving it creates confusion about the directory's status
+- Proper cleanup maintains a clean repository
+
+## Locations with .gitkeep
+
+In this project, the following locations may contain `.gitkeep` files:
+- [temp/.gitkeep](mdc:temp/.gitkeep) - Keeps the temp directory in the repo
+- [docker/template/src/.gitkeep](mdc:docker/template/src/.gitkeep) - Keeps the source directory in the repo
+
+Always check for `.gitkeep` when adding files to these directories and remove it if found.