feat(ultraplan-local): v1.6.0 — /ultraresearch-local deep research command

Add /ultraresearch-local for structured research combining local codebase
analysis with external knowledge via parallel agent swarms. Produces research
briefs with triangulation, confidence ratings, and source quality assessment.

New command: /ultraresearch-local with modes --quick, --local, --external, --fg.
New agents: research-orchestrator (opus), docs-researcher, community-researcher,
security-researcher, contrarian-researcher, gemini-bridge (all sonnet).
New template: research-brief-template.md.

Integration: --research flag in /ultraplan-local accepts pre-built research
briefs (up to 3), enriches the interview and exploration phases. Planning
orchestrator cross-references brief findings during synthesis.

Design principle: Context Engineering — right information to right agent at
right time. Research briefs are structured artifacts in the pipeline:
ultraresearch → brief → ultraplan --research → plan → ultraexecute.

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

plugins/linkedin-thought-leadership/agents/content-repurposer.md

@@ -148,7 +148,7 @@ Old post → Updated post  Easy         High     Any 60+ day old post
 CAROUSEL CONVERSION BLUEPRINT
 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 
-Target: 10-12 slides (optimal engagement)
+Target: 5-8 slides (7 optimal for engagement)
 Design: Large text, mobile-readable (16px+ equivalent)
 
 SLIDE 1: HOOK
@@ -211,7 +211,7 @@ Design specifications:
 VIDEO SCRIPT CONVERSION BLUEPRINT
 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 
-Target length: 60-90 seconds (optimal for LinkedIn)
+Target length: 30-60 seconds (2026 optimal — 30% completion rate minimum)
 Style: Talking head with text overlays
 
 [0:00-0:03] HOOK — 3 seconds