feat: add /release skill for guided releases

[mangelajo]

Summary

• Adds a /release Claude Code skill that interactively guides through the full Jumpstarter release process: creating release branches, tagging releases (RC and final), and contributing operator bundles to community-operators
• Enforces correct ordering (images must exist before bundle generation), RC-first policy for new branches, and vX.Y.Z-rc.N tag naming convention
• Fixes operator release docs by removing the incorrect e2e_test.go update step (defaultControllerImage uses :latest, not a pinned version)

Test plan

• Run /release and verify it asks the right initial questions based on git state
• Dry-run each scenario: new branch, RC tag, final tag, operator bundle
• Verify the RC-first guardrail prevents tagging a final without prior RCs

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 39260953-2c28-47d9-bbee-d45e394ab0d2

📥 Commits

Reviewing files that changed from the base of the PR and between 26aee22 and ad7e777.

📒 Files selected for processing (2)

• .claude/skills/release/SKILL.md
• .cursor/rules/releasing-operator.mdc

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-release-skill

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[mangelajo]

Note: Once #844 lands (operator auto-detects its version for controller/router image defaults), the jumpstarter_types.go update step in this skill (Phase 1, step 1 of "Tag a release") can be removed — the kubebuilder defaults will stay at :latest permanently and the operator will resolve them to its own version tag at runtime.

[mangelajo]

Superseded by updated PR with improvements from the v0.9.0-rc.1 release.