App lifecycle, config, session.
Split into thematic files. See sub-files below.
| Group | Use Cases | File |
|---|---|---|
| Lifecycle | SYS-1 to SYS-6 — Start app, main menu, exit, configure LLM, configure DB, preferences | lifecycle.md |
| Data & Resilience | SYS-7 to SYS-12 — Export, import, backup/restore, retention, error recovery, logging | data-and-resilience.md |