refactor: reorganize scripts into categorized structure
Consolidate 26+ scattered scripts into maintainable hierarchy:
New Structure:
- ci/ CI/CD validation (checks.sh, test.sh, verify-paths.sh)
- dev/ Development workflow (smoke-test.sh, manage-artifacts.sh)
- release/ Release preparation (cleanup.sh, prepare.sh, sanitize.sh, verify.sh, verify-checksums.sh)
- testing/ Test infrastructure (unchanged)
- benchmarks/ Performance tools (track-performance.sh)
- maintenance/ System cleanup (unchanged)
- lib/ Shared functions (unchanged)
Key Changes:
- Unified 6 cleanup-*.sh scripts into release/cleanup.sh with targets
- Merged smoke-test-native.sh into dev/smoke-test.sh --native flag
- Renamed scripts to follow lowercase-hyphen convention
- Moved root-level scripts to appropriate categories
- Updated all Makefile references
- Updated scripts/README.md with new structure
Script count: 26 → 17 (35% reduction)
Breaking Changes:
- Old paths no longer exist, update any direct script calls
- Use make targets (e.g., make ci-checks) for stability
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