feat(system-builder): Cyberpunk RED and Generic as data (4d2)

[over2take]

CYBERPUNK_RED (emp = floor(@humanity / 10)) and GENERIC (nothing) join definitions.js, each held to the games' own applyDerived over 3000 generated sheets in the parity test.

CP:R's code is a trigger on Humanity being written; the engine recomputes on every write. They agree on EMP whenever Humanity is written as a number. The three differences are pinned as tests: a hand-typed EMP survives other writes only in the code; Humanity that isn't a number leaves EMP alone in the code but makes it 0 in the engine; the code rewrites and reports EMP even when it already read right.

Cyberpunk RED is added to the builder's examples: ten stats plus Humanity, eurodollars and Improvement Points, and the NPC generator's four tiers as plain numbers. Generic gets no example, since a copy would be BLANK. The + NEW card's advancement line now uses the system's XP word in the plural. The built-in games are unchanged.

Summary

Test plan

• Tested locally
• Tests pass

Pre-merge checklist

Code quality:

• Code follows project style
• No breaking changes (or clearly documented)
• No console errors or warnings

Version & Release:

• Version bumped? If releasing to users, update:
  • frontend/package.json version
  • docker-compose.yml APP_VERSION
  • CHANGELOG.md with release notes
• GitHub Actions will auto-tag Docker images with the new version

Before merging to main:

• All tests passing
• PR reviewed and approved
• Branch is up to date with main
• No merge conflicts

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