feat: refine bt setup wizard flow, add recommended test-project picker, and update URL format docs

- resolve a single coding agent for the wizard instead of configuring all detected agents
  - default instrumentation workflow docs to all workflows
  - make TUI the default when available
  - add recommended {whoami}-test project creation to the project picker
  - make --language conflict with --no-instrument
  - clarify Braintrust app URL format guidance for generated docs

Author: viadezo1er

skills/sdk-install/braintrust-url-formats.md

@@ -1,33 +1,36 @@
 # Braintrust URL Formats
 
-## App Links (Current Format)
+Use `BRAINTRUST_APP_URL` as the source of truth for app links. It already includes the scheme
+and any required base path. On hosted Braintrust, the default is
+`https://www.braintrust.dev/app`.
+
+## App Links
 
 ### Experiments
 
-`https://BRAINTRUST_APP_URL/{org}/p/{project}/experiments/{experiment_name}?r={root_span_id}&s={span_id}`
+`{BRAINTRUST_APP_URL}/{org}/p/{project}/experiments/{experiment_name}?r={root_span_id}&s={span_id}`
 
 ### Datasets
 
-`https://BRAINTRUST_APP_URL/{org}/p/{project}/datasets/{dataset_name}?r={root_span_id}`
+`{BRAINTRUST_APP_URL}/{org}/p/{project}/datasets/{dataset_name}?r={root_span_id}`
 
 ### Project Logs
 
-`https://BRAINTRUST_APP_URL/{org}/p/{project}/logs?r={root_span_id}&s={span_id}`
+`{BRAINTRUST_APP_URL}/{org}/p/{project}/logs?r={root_span_id}&s={span_id}`
 
 ## Legacy Object URLs
 
-`https://BRAINTRUST_APP_URL/object?object_type=...&object_id=...&id=...`
+`{BRAINTRUST_APP_URL}/object?object_type=...&object_id=...&id=...`
 
 ## URL Parameters
 
-| Parameter          | Description                                                                                                                                                                      |
-| ------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| r                  | The root_span_id - identifies a trace                                                                                                                                            |
-| s                  | The span_id - identifies a specific span within the trace                                                                                                                        |
-| id                 | Legacy parameter for root_span_id in object URLs                                                                                                                                 |
-| BRAINTRUST_APP_URL | url where the app is accessible, www.braintrust.dev/app for non self-hosted instances. See the env variable BRAINTRUST_APP_URL (and use www.braintrust.dev/app if it is not set) |
+| Parameter | Description |
+| --------- | ----------- |
+| `r` | Root span ID. Identifies a trace. |
+| `s` | Span ID. Identifies a specific span within a trace. |
+| `id` | Legacy root span ID parameter in object URLs. |
 
 ## Notes
 
-- The `r=` parameter is always the root_span_id
-- For logs and experiments, use `s=` to reference a specific span within a trace
+- The `r=` parameter is always the `root_span_id`.
+- For logs and experiments, use `s=` to reference a specific span within a trace.