Enable deep mode

By default, trail build uses tree-sitter: every symbol and call edge, no model, no key. trail build --deep adds plain-English summaries of each part of the system, written by the model provider you choose, under your own key.

What deep mode adds

	`trail build`	`trail build --deep`
Every function, class, and call edge (tree-sitter)	✅	✅
Per-file wiring cards	✅	✅
Concept nodes (file summaries + node synthesis)		✅
Per-symbol one-line summary and crux excerpt		✅

Run a deep build

Set your provider

export GRAFT_PROVIDER=openai      # or anthropic, litellm, orcarouter
export GRAFT_API_KEY=<your key>
export GRAFT_MODEL=<model>

See Configure providers.

Run the deep build
Terminal window
```
trail build --deep
```
To summarize only some extensions:
Terminal window
```
trail build --deep -e .ts .py
```

Every pass is cached by content hash, so re-running only touches the files that changed.

See also