Drop closing blanks, honor primary_driver, catalog data-services SKUs

- oci_deck_gen / oci_bizcase_gen: stop appending the Thank You + Oracle
  logo-only closing slides at the end of every generated deck.
- oci_bizcase_gen: Business Drivers now reads primary_driver at the
  drivers-level and at the top level, and renders natural-language values
  verbatim (only snake_case enum tokens are Title-cased). A spec-provided
  drivers.items / additional / secondary list replaces the hardcoded
  "Financial Impact of Inaction" + "Operational Impact" fallback cards.
- oci-sku-catalog.yaml: add data_services category with the four real
  Big Data Service SKUs (B91128/B91129/B91130/B93555) plus EST-DS-NOTEBOOK,
  EST-DS-MODEL, EST-DF-SPARK as estimate placeholders (OCI Data Science /
  Data Flow have no dedicated SKUs in the public pricing API — they are
  billed via the underlying compute shape).
- oci_bom_gen: resolver now prints a stderr warning and tags estimate/
  unknown line items with an explicit note; the xlsx writer renders
  "other" category items under an "Uncategorized — confirm SKUs" section
  at the end instead of silently dropping them.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

kb/pricing/oci-sku-catalog.yaml

@@ -1262,6 +1262,60 @@ categories:
       list_price_usd: 0.0003
       default_hours_units: 1
       billing_type: per_unit
+  data_services:
+    display_name: Oracle Cloud Infrastructure - Data & Analytics Services
+    skus:
+    - sku: B91128
+      product: Oracle Big Data Service - Compute - Standard
+      metric: OCPU Per Hour
+      list_price_usd: 0.1344
+      default_hours_units: 730
+      billing_type: hourly
+    - sku: B91129
+      product: Oracle Big Data Service - Compute - Dense I/O
+      metric: OCPU Per Hour
+      list_price_usd: 0.214
+      default_hours_units: 730
+      billing_type: hourly
+    - sku: B91130
+      product: Oracle Big Data Service - Compute - HPC
+      metric: OCPU Per Hour
+      list_price_usd: 0.1536
+      default_hours_units: 730
+      billing_type: hourly
+    - sku: B93555
+      product: Oracle Big Data Service - Core
+      metric: OCPU Per Hour
+      list_price_usd: 0.015
+      default_hours_units: 730
+      billing_type: hourly
+    # OCI Data Science and Data Flow do not have dedicated SKUs in the Oracle
+    # public pricing API — they are billed via the underlying Compute + Block/Object
+    # Storage consumed by notebook sessions, model-deployment endpoints, and Spark
+    # runs. The entries below are placeholder estimates (VM.Standard3.Flex OCPU rate)
+    # so BOMs can include them as line items; always confirm against the customer's
+    # actual shape + usage before quoting.
+    - sku: EST-DS-NOTEBOOK
+      product: '[ESTIMATE] OCI Data Science - Notebook Session (billed via underlying VM.Standard compute OCPU)'
+      metric: OCPU Per Hour
+      list_price_usd: 0.0255
+      default_hours_units: 730
+      billing_type: hourly
+      estimate: true
+    - sku: EST-DS-MODEL
+      product: '[ESTIMATE] OCI Data Science - Model Deployment endpoint (billed via underlying VM.Standard compute OCPU)'
+      metric: OCPU Per Hour
+      list_price_usd: 0.0255
+      default_hours_units: 730
+      billing_type: hourly
+      estimate: true
+    - sku: EST-DF-SPARK
+      product: '[ESTIMATE] OCI Data Flow - Managed Spark runtime (billed via underlying VM.Standard compute OCPU)'
+      metric: OCPU Per Hour
+      list_price_usd: 0.0255
+      default_hours_units: 730
+      billing_type: hourly
+      estimate: true
   roving_edge:
     display_name: Oracle Roving Edge Infrastructure
     skus: