feat: add back-merge skill

[cs-raj]

Summary

• Adds the back-merge skill for checking and creating back-merge PRs (main/master → development) across repos after a release
• Fully generic — no hardcoded org IDs, Jira domains, or project keys

What the skill does

Two input modes:

• fixVersion — queries Jira for all repos touched in a release (project key extracted automatically from the fixVersion string)
• Repo list — paste GitHub URLs directly
• Both — combine both sources

Two run modes:

• check — read-only audit showing what needs back-merging (default)
• create — raises PRs for all repos that need them (confirmation required)

How to use

/back-merge "PROJ | 16-08-2026 | Release" check
/back-merge https://github.com/org/repo1 https://github.com/org/repo2
/back-merge "PROJ | 16-08-2026 | Release" create

How to install

npx skills add git@github.com:contentstack/contentstack-agent-skills.git --skill back-merge

Requirements

Tool	Install	Auth
gh CLI	brew install gh	gh auth login
Jira MCP	configured in Claude Code	— (fixVersion mode only)

🤖 Generated with Claude Code

[github-actions]

🔒 Security Scan Results

ℹ️ Note: Only vulnerabilities with available fixes (upgrades or patches) are counted toward thresholds.

Check Type	Count (with fixes)	Without fixes	Threshold	Result
🔴 Critical Severity	0	0	10	✅ Passed
🟠 High Severity	0	0	25	✅ Passed
🟡 Medium Severity	0	0	500	✅ Passed
🔵 Low Severity	0	0	1000	✅ Passed

⏱️ SLA Breach Summary

✅ No SLA breaches detected. All vulnerabilities are within acceptable time thresholds.

Severity	Breaches (with fixes)	Breaches (no fixes)	SLA Threshold (with/no fixes)	Status
🔴 Critical	0	0	15 / 30 days	✅ Passed
🟠 High	0	0	30 / 120 days	✅ Passed
🟡 Medium	0	0	90 / 365 days	✅ Passed
🔵 Low	0	0	180 / 365 days	✅ Passed

✅ BUILD PASSED - All security checks passed

[timbenniks-contentstack]

Thanks @cs-raj for putting this together! We're not including it in this bundle, though. This repo is the public set of Contentstack product skills for customers (CMS, SDKs, Live Preview, Launch, Studio…), and this skill automates our internal engineering workflow (post-release back-merges based on our Jira fix versions and branch layout). It would be a great fit for an internal engineering skills repo. Happy to help set one up. We're shipping the current bundle as one release in #21, so I'm closing this here.