fix(pypi): legacy license metadata + README banner

Switch from PEP 639 `license = "MIT"` + `license-files` to legacy
`license = { file = "LICENSE" }` + `License :: OSI Approved :: MIT
License` classifier — PyPI Warehouse rejected the PEP 639 form with
HTTP 400 (Metadata-Version 2.4 License-Expression field not yet
accepted server-side, even though twine check passed locally).

README gains the Codechu ASCII logo banner at the top, matching the
publisher's visual identity across all four sibling libraries.

Author: obarlik

README.md

@@ -1,5 +1,14 @@
 # codechu-cli
 
+```text
+   ___          _           _
+  / __\___   __| | ___  ___| |__  _   _
+ / /  / _ \ / _\` |/ _ \/ __| '_ \| | | |
+/ /__| (_) | (_| |  __/ (__| | | | |_| |
+\____/\___/ \__,_|\___|\___|_| |_|\__,_|
+```
+
+
 Stdlib-only CLI primitives for Python — colors, progress bars, spinners,
 prompts, emoji helpers — with consistent UX across Codechu tools.
 

pyproject.toml

@@ -8,14 +8,15 @@ version = "0.1.0"
 description = "Stdlib-only CLI primitives — colors, progress, prompts, spinners, emoji helpers — with consistent UX across Codechu tools."
 readme = "README.md"
 requires-python = ">=3.10"
-license = "MIT"
-license-files = ["LICENSE"]
+license = { file = "LICENSE" }
+
 authors = [{ name = "Codechu" }]
 keywords = ["cli", "terminal", "ansi", "spinner", "progress", "prompt"]
 classifiers = [
     "Development Status :: 4 - Beta",
     "Environment :: Console",
     "Intended Audience :: Developers",
+    "License :: OSI Approved :: MIT License",
     "Operating System :: POSIX",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.10",