refactor(help): simplify to binary help system + add seed script CLI
Help System Cleanup:
- Simplify HelpLevel from 0|1|2|3 to binary 0|1 (matching actual usage)
- Change BKT help weight from 0.8 to 0.5 for helped answers
- Delete unused PracticeHelpPanel.tsx (~540 lines)
- Delete unused usePracticeHelp.ts (~400 lines)
- Delete unused reinforcement-config.ts
- Remove reinforcement tracking (BKT handles skill weakness detection)
- Update all journey simulator profiles to use binary help arrays
- Update documentation (BKT_DESIGN_SPEC.md, decomposition README)
Seed Script Improvements:
- Add CLI argument parsing with node:util parseArgs
- Add --help, --list, --name, --category, --dry-run flags
- Add new "Forgotten Weaknesses" test profile (weak + stale skill mix)
- Enable seeding individual students or categories
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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