Add OpenClaw integration, emoji/vibe frontmatter, services field, and AP agent cleanup

OpenClaw support:
- Add section-splitting convert_openclaw() to convert.sh that routes
  ## headers by keyword into SOUL.md (persona) vs AGENTS.md (operations)
  and generates IDENTITY.md with emoji + vibe from frontmatter
- Add integrations/openclaw/ to .gitignore

Frontmatter additions (all 112 agents):
- Add emoji and vibe fields to every agent for OpenClaw IDENTITY.md
  generation and future dashboard/catalog use
- Add services field to carousel-growth-engine (Gemini API, Upload-Post)
- Add emoji/vibe to 7 new paid-media agents from PR #83

Agent quality:
- Rewrite accounts-payable-agent to be vendor-agnostic (remove AgenticBTC
  dependency, use generic payments.* interface)

Documentation:
- CONTRIBUTING.md: Add Persona/Operations section grouping guidance,
  emoji/vibe/services frontmatter fields, external services editorial policy
- README.md: Add OpenClaw to supported tools, update agent count to 112,
  reduce third-party OpenClaw repo mention to one-line attribution

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

product/product-behavioral-nudge-engine.md

@@ -2,6 +2,8 @@
 name: Behavioral Nudge Engine
 description: Behavioral psychology specialist that adapts software interaction cadences and styles to maximize user motivation and success.
 color: "#FF8A65"
+emoji: 🧠
+vibe: Adapts software interactions to maximize user motivation through behavioral psychology.
 ---
 
 # 🧠 Behavioral Nudge Engine

product/product-feedback-synthesizer.md

@@ -3,6 +3,8 @@ name: Feedback Synthesizer
 description: Expert in collecting, analyzing, and synthesizing user feedback from multiple channels to extract actionable product insights. Transforms qualitative feedback into quantitative priorities and strategic recommendations.
 color: blue
 tools: WebFetch, WebSearch, Read, Write, Edit
+emoji: 🔍
+vibe: Distills a thousand user voices into the five things you need to build next.
 ---
 
 # Product Feedback Synthesizer Agent

product/product-sprint-prioritizer.md

@@ -3,6 +3,8 @@ name: Sprint Prioritizer
 description: Expert product manager specializing in agile sprint planning, feature prioritization, and resource allocation. Focused on maximizing team velocity and business value delivery through data-driven prioritization frameworks.
 color: green
 tools: WebFetch, WebSearch, Read, Write, Edit
+emoji: 🎯
+vibe: Maximizes sprint value through data-driven prioritization and ruthless focus.
 ---
 
 # Product Sprint Prioritizer Agent

product/product-trend-researcher.md

@@ -3,6 +3,8 @@ name: Trend Researcher
 description: Expert market intelligence analyst specializing in identifying emerging trends, competitive analysis, and opportunity assessment. Focused on providing actionable insights that drive product strategy and innovation decisions.
 color: purple
 tools: WebFetch, WebSearch, Read, Write, Edit
+emoji: 🔭
+vibe: Spots emerging trends before they hit the mainstream.
 ---
 
 # Product Trend Researcher Agent