fix: add displayName to model-regression roles

[juhgiyo]

Summary

• Add missing displayName field to model-regression-agent and model-regression-evaluator ROLE.md frontmatter
• Required for StrawHub registry publishing (API returns 400 without it)

Test plan

• Both roles published successfully to StrawHub after this fix
• Both roles install correctly via strawhub install

🤖 Generated with Claude Code

[juhgiyo]

🔍 Code Review Triage — Risk Classification

Risk Level: LOW 🟢
Recommendation: FAST-TRACK

What this PR does

Adds missing displayName frontmatter field to 2 ROLE.md files (model-regression-agent, model-regression-evaluator). Required for StrawHub registry publishing — API returns 400 without it.

Triage summary

Dimension	Assessment
Scope	+2 lines, 2 files, YAML metadata only
Risk areas	None — no auth, security, DB, infra, or logic changes
AI signals	0/6 detected (co-authored by Claude but change is trivially correct)
Pattern match	✅ Consistent with displayName in all other published roles
CI	N/A — no checks configured for this repo

Recommendation

Fast-track approval. The diff is self-evident, follows the established pattern, and the author has verified both roles publish and install correctly.

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🤖 Triaged by code-review-triage-agent — dogfooding run

[juhgiyo]

🔍 Code Review Triage — Risk Classification

🟢 LOW RISK — Fast-track eligible

Field	Value
Risk Level	🟢 Low
Size	2 additions, 0 deletions, 2 files
Category	Config/metadata fix
AI Signals	None relevant (co-authored, but change is trivial)
Recommendation	Fast-track approval if reviewer agrees

Why low risk

• Metadata-only: adds displayName string to YAML frontmatter — no executable code
• Minimal blast radius: 2 lines, cosmetic registry field
• Already validated: both roles published and installed successfully post-fix
• No security surface: display name has no auth/data/infra implications

Focus areas

• Verify: displayName values match intended human-readable names ✅
• Skip: everything else — no behavioral changes to review

Observation

Other roles (ci-debug-agent, code-review-triage-agent, etc.) are also missing displayName. Consider a follow-up PR to add it to all roles proactively.

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🤖 Triaged by code-review-triage-agent — dogfooding run #1