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/comet.yaml

@@ -0,0 +1,19 @@
+format_version: 1
+name: comet
+display_name: Comet ML / Opik
+tier: 6
+last_verified: "2026-04-05"
+keywords:
+  - "comet_ml"
+  - "comet-ml"
+  - "COMET_API_KEY"
+  - "COMET_WORKSPACE"
+  - "opik"
+  - "comet.com"
+verify:
+  method: GET
+  url: https://www.comet.com/api/rest/v2/workspaces
+  headers:
+    Authorization: "{KEY}"
+  valid_status: [200]
+  invalid_status: [401, 403]