feat(03-02): add voice and image/video Tier 3 providers

- Deepgram (hex40, low confidence)
- ElevenLabs (hex32, XI_API_KEY header)
- Stability AI (sk- prefix, medium confidence)
- Runway (keyword-only)
- Midjourney (keyword-only, no official API)

Completes PROV-03: 12 Tier 3 Specialized providers (with pre-existing huggingface).

providers/deepgram.yaml

@@ -0,0 +1,21 @@
+format_version: 1
+name: deepgram
+display_name: Deepgram
+tier: 3
+last_verified: "2026-04-05"
+keywords:
+  - "deepgram"
+  - "DEEPGRAM_API_KEY"
+  - "api.deepgram.com"
+  - "dg-api"
+patterns:
+  - regex: '[a-f0-9]{40}'
+    entropy_min: 4.0
+    confidence: low
+verify:
+  method: GET
+  url: https://api.deepgram.com/v1/projects
+  headers:
+    Authorization: "Token {KEY}"
+  valid_status: [200]
+  invalid_status: [401, 403]

providers/elevenlabs.yaml

@@ -0,0 +1,22 @@
+format_version: 1
+name: elevenlabs
+display_name: ElevenLabs
+tier: 3
+last_verified: "2026-04-05"
+keywords:
+  - "elevenlabs"
+  - "ELEVENLABS_API_KEY"
+  - "ELEVEN_API_KEY"
+  - "XI_API_KEY"
+  - "api.elevenlabs.io"
+patterns:
+  - regex: '[a-f0-9]{32}'
+    entropy_min: 4.0
+    confidence: low
+verify:
+  method: GET
+  url: https://api.elevenlabs.io/v1/user
+  headers:
+    xi-api-key: "{KEY}"
+  valid_status: [200]
+  invalid_status: [401, 403]

providers/midjourney.yaml

@@ -0,0 +1,17 @@
+format_version: 1
+name: midjourney
+display_name: Midjourney
+tier: 3
+last_verified: "2026-04-05"
+keywords:
+  - "midjourney"
+  - "MIDJOURNEY_API_KEY"
+  - "MJ_API_KEY"
+  - "midjourney.com"
+  - "useapi.net"
+verify:
+  method: GET
+  url: ""
+  headers: {}
+  valid_status: []
+  invalid_status: []

providers/runway.yaml

@@ -0,0 +1,19 @@
+format_version: 1
+name: runway
+display_name: Runway
+tier: 3
+last_verified: "2026-04-05"
+keywords:
+  - "runway"
+  - "runwayml"
+  - "RUNWAY_API_KEY"
+  - "RUNWAYML_API_SECRET"
+  - "api.runwayml.com"
+  - "dev.runwayml.com"
+verify:
+  method: GET
+  url: https://api.dev.runwayml.com/v1/tasks
+  headers:
+    Authorization: "Bearer {KEY}"
+  valid_status: [200, 400]
+  invalid_status: [401, 403]

providers/stability.yaml

@@ -0,0 +1,22 @@
+format_version: 1
+name: stability
+display_name: Stability AI
+tier: 3
+last_verified: "2026-04-05"
+keywords:
+  - "stability"
+  - "STABILITY_API_KEY"
+  - "STABILITY_KEY"
+  - "api.stability.ai"
+  - "stable-diffusion"
+patterns:
+  - regex: 'sk-[A-Za-z0-9]{48}'
+    entropy_min: 4.0
+    confidence: medium
+verify:
+  method: GET
+  url: https://api.stability.ai/v1/user/account
+  headers:
+    Authorization: "Bearer {KEY}"
+  valid_status: [200]
+  invalid_status: [401, 403]