Resolve persisted attachment paths across server pipelines

- add shared attachment path normalization and resolution helpers
- reuse persisted image files for turn start and branch name generation
- cover persisted attachment flow in text generation and reactor tests
d3d0a08237Julius Marminge committed on 3/1/2026, 6:58:59 AMparent9b0fe5e
7 files changedLine totals unavailable