fix: allow prerelease candidate promotion

[ytallo]

Summary

• mark successful experimental, alpha, and beta candidates on next as promotable
• accept supported prerelease versions during promotion and require evidence maturity to match the exact version suffix
• keep promoted prerelease GitHub releases marked as prereleases while leaving the repository-wide GitHub Latest release unchanged
• preserve immutable tag identity, run-attempt and evidence validation, candidate smoke checks, Registry compare-and-set protection, image digest checks, and the full deployed E2E gate for Harness

Direct prerelease publication to latest was enabled separately in #744.

Companion Release Control change: iii-hq/release-control#8

Validation

• .github/scripts/tests: 247 tests plus 3 subtests passed
• actionlint v1.7.12 on all workflows
• benchmark site tests: 33 passed
• Python compile checks for the changed release scripts
• git diff --check

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Project	Deployment	Actions	Updated (UTC)
workers	Building	Preview	Aug 7, 2026 2:31pm
workers-tech-spec	Ready	Preview	Aug 7, 2026 2:31pm

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: f92f4762-6cc4-4ba9-a272-db684d77bdd6

📥 Commits

Reviewing files that changed from the base of the PR and between c78888d and bb1a28e.

📒 Files selected for processing (6)

• .github/scripts/release_candidate.py
• .github/scripts/tests/test_release_candidate.py
• .github/workflows/promote-worker.yml
• .github/workflows/release.yml
• .github/workflows/repair-worker-release.yml
• docs/sops/release.md

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[github-actions]

skill-check — worker

0 verified, 56 skipped (no docs/).

Layer	Result
structure	✓
vale	✓
ai	✓
render	✓

Four for four. Nicely done.