[Improve] Harden DCG binary installation

[navedmerchant]

What changed

Completes the DCG binary-service safeguards with macOS temporary-directory support, an explicit skipped ZIP-only test on non-Windows CI, and coverage for trusted cross-host GitHub release redirects.

Why this change was made

DCG must run with the minimum viable environment and install predictably across supported platforms and GitHub's release-asset redirect flow. Closes #1056.

Impact

DCG installation and execution are more reliable across platforms while keeping extension-host secrets out of the child process environment.

Related PRs

• Managed binary infrastructure
• DCG setting
• DCG command integration
• DCG documentation

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[codecov]

Codecov Report

❌ Patch coverage is 95.34884% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/services/destructive-command-guard/runner.ts	92.15%	0 Missing and 4 partials ⚠️

📢 Thoughts on this report? Let us know!

[edelauna]

Looks good - just had 2 comments for increased test coverage.

[edelauna]

😅 have a couple additional comments related to the logic used for the guard.

[edelauna]

Looks good - approving with some minor nits, which could also always be addressed later if we want.

[zoomote]

Addressed all current unresolved review feedback in 5f3854a. DCG now preserves TMPDIR, covers trusted release redirects, and reports the ZIP-only scenario as skipped on non-Windows CI.