feat: add update-template command to synchronize task.template with library.md

- Added `update-template` command that extracts rows from `library.md` and updates `task.template`
- Implemented logic to replace existing rows in `task.template` with current rows from `library.md`
- Added `update-template` to help-table for documentation and discoverability
- Updated `library.md` and `task.template` to include new `update-template` command
- Removed outdated prompt script that was no longer needed
- Ensured all rows from `library.md` are properly synchronized with `task.template`

patterns.md

@@ -6,7 +6,17 @@ layout: layouts/base.njk
 
 The task file from the specification is very basic. Commands can also have parameters and call each other.
 
-The following is a collection of more complex task file patterns.
+The following is a collection of advanced task file patterns.
+
+## Load dotenv variables.
+
+Load environment variables from the `.env` file.
+
+```bash
+if [[ -a ".env" ]]; then
+    source .env
+fi
+```
 
 ## Set default parameter
 
@@ -84,7 +94,7 @@ template-with-env() {
 }
 ```
 
-## Create Python virtual  env for git branch
+## Create Python virtual env for git branch
 
 Initialize Python virtual env with uv.
 
@@ -312,4 +322,4 @@ if [[ -d ".git" ]]; then
         export $(cat ".env.$GIT_BRANCH" | sed 's/^#.*//g' | xargs)
     fi
 fi
-```
+```