fix(packaging): make pip-installed CLI entry point work

[Gperez88]

Summary

Fixes pr32-sprite-compiler after pip install from git (ModuleNotFoundError: No module named 'main'), and avoids ttkbootstrap 2.x GUI breakage.

Closes #18

Changes

File	Change
pr32_sprite_compiler/cli.py	New packaged CLI/GUI launcher (lazy GUI import)
pr32_sprite_compiler/__main__.py	Support python -m pr32_sprite_compiler
main.py	Thin wrapper for local/PyInstaller runs
pyproject.toml	Entry point pr32_sprite_compiler.cli:main; pin ttkbootstrap<2; bump 0.3.1
tests/test_cli_entry.py	Smoke tests for --help without GUI extras
CHANGELOG.md / README.md / release workflow	Document and pin GUI dep

Test plan

• pytest tests/test_cli_entry.py
• python -m pr32_sprite_compiler --help
• Fresh venv: pip install -e . then pr32-sprite-compiler --help
• Fresh venv: pip install . (non-editable) then pr32-sprite-compiler --help
• Optional: pip install -e '.[gui]' then GUI launches with no args

Notes

Tool Suite installs this package from @develop for golden compile tests / packaging. After merge, reinstall from develop on the Mac venv.

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