Why: establish the authorized task workspace and its initial baseline.
Evidence: preserved precheck receipt in .task/feature-agent-stack-audit-remediation-b1.md; R0=d9e9c0560a2767539f4415b579adbeff86a22ba6.
Impact: task metadata only; the feature workspace starts at d9e9c0560a.
Refs: .task/feature-agent-stack-audit-remediation-b1.md