docs(guardrails): block-dangerous-git contract names Bash and PowerShell

[kyle-sexton]

Summary

Reword the opening contract comment in block-dangerous-git.sh so it names both
tool surfaces the hook is registered for. The hooks.json matcher is
Bash|PowerShell, and the file already documents the bundled PowerShell grammar
classifier a few lines below — only the first sentence still said Bash-only.

Docs accuracy only; no behavior change.

Fixes #2145

Test plan

• scripts/affected-tests.sh --run plugins/guardrails/hooks/block-dangerous-git.sh
  — PASS=381 FAIL=0

Related

• fix(guardrails): block-dangerous-git still clears an unsafe --force-with-lease via payload cwd and env -S #2124 — live bypass in the same guard (unrelated; filed separately)
• Triage the remaining stranded P2 review findings from the post-merge sweep #1938 — stranded post-merge review-findings sweep

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[github-actions]

Warning

Automated review did not complete — this is an infrastructure failure, not a review verdict.

Treat any Claude comment on this PR (including a placeholder like "I'll analyze this and get back to you") as incomplete, not "no findings."

• Run: https://github.com/melodic-software/claude-code-plugins/actions/runs/31546352940
• Failure class: other
• Last SDK result: (no execution file was produced)

Re-run the job to retry the review. A new push re-triggers this lane only if the caller's pull_request triggers include synchronize (the canonical caller omits it).
An automatic retry may already have run — it is skipped when a partial review could duplicate comments, or when the failure class needs an operator (auth).