feat(03-07): add 8 emerging labs, writing tools, observability providers

- Reka, Aleph Alpha, Lamini (emerging LLM labs)
- Writer, Jasper, Typeface (writing tools)
- Comet ML/Opik, Weights & Biases (observability)
- Dual-located in providers/ and pkg/providers/definitions/

providers/wandb.yaml

@@ -0,0 +1,22 @@
+format_version: 1
+name: wandb
+display_name: Weights & Biases
+tier: 6
+last_verified: "2026-04-05"
+keywords:
+  - "wandb"
+  - "weights_and_biases"
+  - "WANDB_API_KEY"
+  - "api.wandb.ai"
+  - "wandb.ai"
+patterns:
+  - regex: '[a-f0-9]{40}'
+    entropy_min: 3.5
+    confidence: low
+verify:
+  method: GET
+  url: https://api.wandb.ai/graphql
+  headers:
+    Authorization: "Basic {KEY}"
+  valid_status: [200, 400]
+  invalid_status: [401, 403]