bug(windows): provide a guard-compatible after-hours push override

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Feedback type

Bug report / Windows command UX

Concise description

The documented after-hours override can be valid policy-wise but awkward or rejected when expressed as an environment-prefixed Git command in Windows PowerShell/Codex Desktop. PowerShell does not support the POSIX NAME=value git push ... command shape, and a compound $env:NAME=...; git push ... shape may be rejected by command-shape enforcement even when the push is otherwise proof-bound.

Local context

Observed in a public consumer repository during an overnight, proof-bound lifecycle push from a retained linked worktree. Fable review was available and succeeded; this is not a reviewer-fallback problem.

Evidence

• Candidate was committed only after focused 36/36, broader 729/729, and exact required suite 2,344/2,344.
• Normal Git hooks remained enabled.
• The narrow working PowerShell form was Start-Process -FilePath git -ArgumentList @('push','origin','<branch>') -WorkingDirectory (Get-Location) -Environment @{ AFTERHOURS_SKIP='1' } -NoNewWindow -Wait -PassThru.
• The push succeeded and the hosted required-suite gate started normally.
• No source code, secrets, customer data, or proprietary evidence is needed to reproduce.

What should change

• Ship an explicit Windows PowerShell example or guarded helper for the approved after-hours push override.
• Teach command normalization to recognize the safe PowerShell environment-scoped form without treating it as an ambiguous compound command.
• Preserve all existing proof freshness, reviewed-candidate, same-repository linked-worktree, remote/refspec, and native-hook checks.
• Add Windows regression coverage for the documented form.