# nFlow Session 8 — Custom Node Creator (Final)

See `krystv/nflow/docs/SESSION_HANDOFF.md` for full details.

## Compile Fixes Applied

Session 8 included a static analysis pass (no sandbox available) that identified and fixed:

1. `user_nodes.rs` — removed unused imports at module level (`Dim/Disclosure/DType`)
2. `user_nodes.rs` — `_registry` parameter renamed to suppress unused-variable warning
3. `user_nodes.rs` — test `make_passthrough_uc` `mut` removed
4. `nfl.rs` — removed unused `UserCompositeStore` import
5. `view.rs` — removed invalid `pub use ExecCoverageView as ExecCoverageViewAlias` (compile error)
6. `view.rs` — removed duplicate `RunResultView2`

## Key Architecture

```
┌─────────────────────────────────────────────────────────────┐
│  UserComposite (IR)                                         │
│  uid: "user.mamba_ssm"  colour: "#a855f7"                  │
│  ports_in/out, attrs, inner_graph: Graph                    │
│  paper_url: "https://arxiv.org/abs/2312.00752"              │
└──────────────────────┬──────────────────────────────────────┘
                       │ infer_user_composite()
    ┌──────────────────▼───────────────────┐
    │  Session.run_inference               │
    │  op.starts_with("user.") →           │
    │  clone inner_graph + seed inputs +   │
    │  run inference + read output types   │
    └──────────────────────────────────────┘
                       │
    ┌──────────────────▼───────────────────┐
    │  redb (embedded database)            │
    │  global_nodes | recent_files |       │
    │  app_settings                        │
    └──────────────────────────────────────┘
```

## Expected Test Count After Sandbox

~187 total = 174 (before) + 5 (UserComposite IR) + 3 (redb) + 5 (user_nodes inference)

## Next Priorities

1. Sandbox compile verification
2. Codegen lowering for user composites
3. Double-click → editor tab in Editor canvas
4. CompositePropertiesPanel (port/attr schema editor)
5. redb path using `app_data_dir()`
6. npm build verification