feat: add path completion, LCP-based suggestions, and validator tests

- Refactored `FalyxCompleter` to support longest common prefix (LCP) completions by default.
- Added `_ensure_quote` helper to auto-quote completions containing spaces/tabs.
- Integrated `_yield_lcp_completions` for consistent completion insertion logic.
- Added `_suggest_paths()` helper to dynamically suggest filesystem paths for arguments of type `Path`.
- Integrated path completion into `suggest_next()` for both positional and flagged arguments.
- Updated `argument_examples.py` to include a `--path` argument (`Path | None`), demonstrating file path completion.
- Enabled `CompleteStyle.COLUMN` for tab-completion menu formatting in interactive sessions.
- Improved bottom bar docstring formatting with fenced code block examples.
- Added safeguard to `word_validator` to reject `"N"` since it’s reserved for `yes_no_validator`.
- Improved help panel rendering for commands (using `Padding` + `Panel`).
- Added full test coverage for:
  - `FalyxCompleter` and LCP behavior (`tests/test_completer/`)
  - All validators (`tests/test_validators/`)
- Bumped version to 0.1.80.

examples/argument_examples.py

@@ -1,5 +1,6 @@
 import asyncio
 from enum import Enum
+from pathlib import Path
 
 from falyx import Falyx
 from falyx.action import Action
@@ -21,13 +22,14 @@ async def test_args(
     service: str,
     place: Place = Place.NEW_YORK,
     region: str = "us-east-1",
+    path: Path | None = None,
     tag: str | None = None,
     verbose: bool | None = None,
     number: int | None = None,
 ) -> str:
     if verbose:
-        print(f"Deploying {service}:{tag}:{number} to {region} at {place}...")
-    return f"{service}:{tag}:{number} deployed to {region} at {place}"
+        print(f"Deploying {service}:{tag}:{number} to {region} at {place} from {path}...")
+    return f"{service}:{tag}:{number} deployed to {region} at {place} from {path}."
 
 
 def default_config(parser: CommandArgumentParser) -> None:
@@ -52,6 +54,11 @@ def default_config(parser: CommandArgumentParser) -> None:
         help="Deployment region.",
         choices=["us-east-1", "us-west-2", "eu-west-1"],
     )
+    parser.add_argument(
+        "--path",
+        type=Path,
+        help="Path to the configuration file.",
+    )
     parser.add_argument(
         "--verbose",
         action="store_bool_optional",