ci: migrate releases to unified pipeline

[steipete]

Summary

• call the unified Go CLI release workflow at v1.0.0-alpha.12
• route Homebrew handoff explicitly to steipete/homebrew-tap
• retire tag-triggered legacy publishing while retaining the documented manual fallback

Verification

• actionlint .github/workflows/release-unified.yml .github/workflows/release-legacy.yml
• go test ./...
• AutoReview: clean

No release dispatch in this PR.

[chatgpt-codex-connector]

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Reviewed commit: 39b44b4544

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[chatgpt-codex-connector]

Add package.json version before using unified release

When this workflow is dispatched against the current repo, the called openclaw/release-workflows@v1.0.0-alpha.12 validation path unconditionally checks the root package.json if it exists and runs jq -er '.version' before comparing it to the release version. This repo's package.json has no version field, so the new unified release path exits during validation before it can tag or build any release; add/sync the package version or use a workflow/input that ignores this helper package.

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