fix(workflow): non-forgeable irrecoverable auth, merger consumer, exact-scope cleanup (#709)
Address formal review 434 REQUEST_CHANGES on PR #710: - F1: replace caller operator_authorized with server-side HMAC auth artifacts - F2: implement fail-closed merger consumption for prior-provenance only - F3: enforce remote/org/repo/head on cross-profile load and clear Co-Authored-By: Grok 4.5 (xAI) <[email protected]>
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