Detect KISA copyright holder with parenthesized expansion

[gaoflow]

Fixes #5125.

Summary

• Treat an uppercase acronym followed by an opening parenthesized expansion, such as KISA(Korea, as a proper-name token before the broader middle-parenthesis JUNK rule.
• Add a data-driven copyright fixture for Copyright (c) 2007 KISA(Korea Information Security Agency).
• Add my name to AUTHORS.rst as requested by the contribution guide.

Tests

• .venv/bin/python -m py_compile src/cluecode/copyrights.py tests/cluecode/test_copyrights.py
• git diff --check
• Targeted detect_copyrights_from_lines() check for the KISA sample, expecting both the full copyright and holder.
• pytest tests/cluecode/test_copyrights.py -k kisa_seed_local --test-suite all -q passes locally when using a pure-text numbered_text_lines shim; the full local ScanCode test environment is blocked by missing libmagic on this macOS arm64 setup.

AI assistance was used under my direction.