feat(03-06): add Databricks, Snowflake, Oracle GenAI, HPE GreenLake Tier 9 providers

- Databricks dapi-prefixed high-confidence regex pattern
- Snowflake/Oracle/HPE keyword-only detection
- Completes PROV-09 (8 Tier 9 enterprise providers)

providers/snowflake.yaml

@@ -0,0 +1,19 @@
+format_version: 1
+name: snowflake
+display_name: Snowflake Cortex
+tier: 9
+last_verified: "2026-04-05"
+keywords:
+  - "snowflake"
+  - "SNOWFLAKE_ACCOUNT"
+  - "SNOWFLAKE_USER"
+  - "SNOWFLAKE_PASSWORD"
+  - "SNOWFLAKE_PRIVATE_KEY"
+  - "snowflakecomputing.com"
+  - "cortex"
+verify:
+  method: GET
+  url: ""
+  headers: {}
+  valid_status: []
+  invalid_status: []