Fix agent frontmatter name consistency to use human-readable names

Update 19 agent name: fields from slug-style (e.g. "engineering-ai-engineer")
or code-style (e.g. "ArchitectUX") to clean human-readable names (e.g.
"AI Engineer", "UX Architect"). Add missing YAML frontmatter to 2 spatial-
computing agents. All 51 agents now use consistent naming that aligns with
the NEXUS strategy docs.

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

product/product-feedback-synthesizer.md

@@ -1,5 +1,5 @@
 ---
-name: product-feedback-synthesizer
+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, Bash

product/product-sprint-prioritizer.md

@@ -1,5 +1,5 @@
 ---
-name: product-sprint-prioritizer
+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, Bash

product/product-trend-researcher.md

@@ -1,5 +1,5 @@
 ---
-name: product-trend-researcher
+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, Bash