Exclude out/lint from the Foundry.contracts property glob.

[anvacaru]

forge lint writes minimal artifacts that lack the AST section, causing the error below to always trigger on the second run, as the linter runs automatically.

"Must have 'ast' field in solc output. Make sure `ast = true` is present in `foundry.toml` and run `forge clean`

In this PR, I'm omitting all the contracts under out/lint as the artifacts are duplicated and not needed by kontrol.

Other Cleanups:

• find_enums function definition is moved out of the loop, as originally it was re-created as a new function object on every iteration.
• Eliminated str↔Path round-trip: glob results stay as Path objects throughout.
• json_path.stem replaces split('/')[-1][:-5]: idiomatic and OS-safe.
• Three list-comprehension passes collapsed into a single sorted() generator expression.
• Added a default value for dct.get('nodes', []) in find_enums to avoid KeyError on leaf AST nodes.
• Compute enum_max once and reuse instead of calling len(dct['members']) twice.

[juliankuners]

LGTM