feat(03-04): add CodeWhisperer, Replit AI, Codestral, watsonx, Oracle AI providers

- Codestral with low-confidence 32-char generic pattern + high entropy
- watsonx with IBM IAM token endpoint for verification
- CodeWhisperer, Replit AI, Oracle AI as keyword-only
- Completes PROV-07 (10 Tier 7 code/dev tools providers)

providers/replit-ai.yaml

@@ -0,0 +1,17 @@
+format_version: 1
+name: replit-ai
+display_name: Replit AI (Ghostwriter)
+tier: 7
+last_verified: "2026-04-05"
+keywords:
+  - "replit"
+  - "ghostwriter"
+  - "REPLIT_TOKEN"
+  - "REPLIT_DB_URL"
+  - "replit.com"
+verify:
+  method: GET
+  url: ""
+  headers: {}
+  valid_status: []
+  invalid_status: []