chore(mtmharness): align DSH dependencies with alpha3

[codeh007]

Summary

• align mtmharness DSH peer and development dependencies to 0.1.2-alpha.3
• add the alpha3 dsh-session-turn-outline dependency
• regenerate and policy-validate the workspace lockfile

Closes #778

Verification

• pnpm install --frozen-lockfile
• pnpm --filter mtmharness run typecheck
• pnpm --filter mtmharness run check
• pnpm --filter mtmharness run test
• pnpm why @deepseek-ai/dsh-session-turn-outline,

[coderabbitai]

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