Clean non-stable seeded release assets

[elibosley]

Summary

• broaden seeded release cleanup to stale Installer-* tags, not just older stable semver tags
• remove bundled seeded IMG assets from non-stable release tags such as RC tags
• keep online installer assets untouched when present
• update docs to describe older and non-stable cleanup

Why

The latest-stable seeded image policy should not leave bundled seeded artifacts on release-candidate tags. Older and non-stable releases should use the online installer path instead.

Validation

• Ruby YAML parse for .github/workflows/update-unraid-release-lock.yml
• cleanup selection Python snippet covers older stable, current stable, future stable, and RC tags
• git diff --check

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro (Legacy)

Run ID: c8537710-663a-4d33-8f69-91908a5dd6ba

📥 Commits

Reviewing files that changed from the base of the PR and between f1ee910 and f11f9e2.

📒 Files selected for processing (3)

• .github/workflows/update-unraid-release-lock.yml
• docs/USER_COMMANDS.md
• docs/user-build.md

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