[Feat] Add the Destructive Command Guard binary service

[navedmerchant]

Related GitHub Issue

Closes #1056
Part of #1049. Split from #1050.

Description

Adds a self-contained service boundary for the pinned Destructive Command Guard binary. It selects platform-specific archives, installs and verifies the binary through the managed-binary infrastructure, deduplicates concurrent installation requests, and runs DCG with typed allow/deny results.

This PR does not add a setting or change command auto-approval behavior.

Stack

2 / 4 — base: feat/managed-binary-infrastructure

Review only the six files in this PR's own diff. Merge after the managed-binary PR; GitHub will retarget the surviving stack automatically or the base can be changed to main after its dependency merges.

Test Procedure

pnpm --dir src exec vitest run services/destructive-command-guard/__tests__/manager.spec.ts services/destructive-command-guard/__tests__/runner.spec.ts
pnpm --dir src check-types

Result: 2 test files passed, 22 tests passed; type-check passed. Repository pre-push type-check also passed.

Checklist

• Focused issue and independently meaningful service
• Tests included and passing
• Type-check/lint passing
• No changeset added
• No user-facing behavior enabled yet

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[codecov]

Codecov Report

❌ Patch coverage is 91.89189% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/services/destructive-command-guard/runner.ts	90.47%	0 Missing and 4 partials ⚠️
src/services/destructive-command-guard/manager.ts	92.30%	1 Missing and 1 partial ⚠️

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