release: v1.6.0 — community-marketing skill, 3 new tools, skill enhancements

[coreyhaines31]

Summary

New skill

• community-marketing — Community strategy, platform selection, ambassador programs, health metrics (contributed by @pangerlkr)

New tools

• SparkToro — Audience research and behavioral intelligence
• RB2B — B2B visitor identification
• Gong — Revenue intelligence and call analytics

Skill enhancements

• ai-seo: Added pricing.md recommendation for AI agent discoverability
• ab-test-setup: Added Growth Experimentation Program (experiment loop, ICE scoring, velocity tracking)
• social-content: Expanded content repurposing with podcast/video/webinar/newsletter workflows and content atoms framework
• social-content: Added platform limits reference -- hashtag limits, character counts, truncation thresholds for 8 platforms (contributed by @MarianoGarciaGz)
• copy-editing: Added expert panel scoring for multi-persona copy review
• copy-editing: Added content refresh editing framework (references/content-refresh.md)

Not included (next release)

• ASO audit skill (holding for v1.7.0)
• Skill renames (separate PR feat: rename 15 skills and consolidate CRO #216)

Test plan

• Verify community-marketing skill installs correctly
• Verify tool integration guides render properly
• Spot-check cross-references in enhanced skills

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