Add an `ask` attribute to commands that shows a y/n confirmation
before executing. If the user declines, the command is skipped but
the task continues with the next command.
Example:
```yaml
cmds:
- cmd: echo "Deploying..."
ask: "Deploy to production?"
- task: run-migrations
ask: "Run database migrations?"
```
Behavior:
- Default: asks for y/n confirmation
- --yes: auto-confirms all asks
- --dry: shows commands without asking
This differs from task-level `prompt:` which cancels the entire task
if declined. Command-level `ask:` only skips the individual command.
* refactor: moved/simplified snippets into its own file with tests
* refactor: move snippet to taskfile package
* feat: support snippets with line/col = 0
* feat: functional options for snippets
* feat: added option to hide snippet indicators
* feat: store raw lines for length calculations
* feat: add debug function for TaskfileDecodeError
* fix: decode errors from commands
* fix: schema for defer cmd calls
* fix: linting issues
* refactor: split var and vars into different files like other structures
