chore: bump version to 0.4.9

- Fix zsh @shell bootstrap failure (TERM=dumb + interactive hooks)
- Improve remote error messages with failed command, output, and stderr details
- Sync __version__ in __init__.py with pyproject.toml (was previously 0.4.3)

Author: Akagi201

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "shellflow"
-version = "0.4.8"
+version = "0.4.9"
 description = "A minimal shell script orchestrator with SSH support"
 readme = "README.md"
 license = "Apache-2.0"

src/shellflow/__init__.py

@@ -55,7 +55,7 @@
 from .parser import _clean_commands, parse_script
 from .runner import run_script
 
-__version__ = "0.4.3"
+__version__ = "0.4.9"
 
 __all__ = [
     "EXIT_EXECUTION_FAILURE",