fix: add pre-commit hooks and fix all lint/type/format errors

Process bug fix: no pre-commit existed for this repo's Python code.
Added pyproject.toml with unified dependencies (ruff, mypy, ansible-lint),
.pre-commit-config.yaml with repo-based hooks (ruff) and local uv-run
hooks (mypy, ansible-lint).

Fixed 249 ruff errors (B023, B904, B006, B007, UP008, UP031, C408),
~13 mypy type errors, 11 ansible-lint violations, and ruff-format
across all Python files including stack-orchestrator subtree.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

stack_orchestrator/repos/fetch_stack.py

@@ -17,9 +17,9 @@
 # CERC_REPO_BASE_DIR defaults to ~/cerc
 
 
-import click
 import os
 
+import click
 from decouple import config
 from git import exc
 
@@ -36,9 +36,7 @@ from stack_orchestrator.util import error_exit
 @click.pass_context
 def command(ctx, stack_locator, git_ssh, check_only, pull):
     """Optionally resolve then git clone a repository with stack definitions."""
-    dev_root_path = os.path.expanduser(
-        str(config("CERC_REPO_BASE_DIR", default="~/cerc"))
-    )
+    dev_root_path = os.path.expanduser(str(config("CERC_REPO_BASE_DIR", default="~/cerc")))
     if not opts.o.quiet:
         print(f"Dev Root is: {dev_root_path}")
     try: