`specfact project regenerate` crashes with `NoneType` during bundle processing

[danieldekay]

Summary

Running specfact project regenerate fails with:

Error: 'NoneType' object has no attribute 'items'

The command completes bundle loading first, then crashes.

Reproduction

specfact project regenerate

Actual Output

SpecFact CLI - v0.46.28
Started: 2026-05-29 19:07:42
✓ Bundle loaded: 515 artifact(s) (16.82s)
⚠️  Backlog graph functionality moved to 'backlog' command group.
ℹ️  Use: specfact backlog analyze-deps or specfact backlog graph-export
Error: 'NoneType' object has no attribute 'items'
✗ Finished: 2026-05-29 19:07:59 | Duration: 16.94s

Expected Behavior

• Command should complete successfully, or
• Return a typed/user-facing validation error indicating which config/artifact key is null and where.

Notes

• The migration warning about backlog commands appears first; this may indicate a legacy/null config path in regenerate flow.

Environment

• OS: macOS
• SpecFact CLI: v0.46.28