feat: add revops and sales-enablement skills

Fill the revenue operations and internal sales collateral gaps in the
marketing skills collection. revops covers lead lifecycle, scoring,
routing, pipeline management, and CRM automation. sales-enablement
covers pitch decks, one-pagers, objection handling, demo scripts, and
sales playbooks. Cross-references added to 6 existing skills.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

skills/pricing-strategy/SKILL.md

@@ -227,3 +227,5 @@ Identifies which features customers value most:
 - **copywriting**: For pricing page copy
 - **marketing-psychology**: For pricing psychology principles
 - **ab-test-setup**: For testing pricing changes
+- **revops**: For deal desk processes and pipeline pricing
+- **sales-enablement**: For proposal templates and pricing presentations