feat: add external evidence action criteria

[wlsdks]

Summary

• Add structured action criteria to quality-evidence recommended next slices.
• External recommendations now include preconditions, completion_evidence, and guardrails.
• Render those fields in the human CLI output so operators know what must be true before running an external action and what proves completion.

Effect Check

• promptlane_95_quality remains pending with the same external blockers.
• This does not claim scheduled ui-patrol or native dialog approved dogfood completion.
• It makes the remaining work more executable by distinguishing preconditions, completion evidence, and non-substitutable guardrails.

Verification

• RED: focused quality tests failed before implementation because recommended slices lacked structured action criteria.
• GREEN: corepack pnpm vitest run src/cli/commands/quality-evidence.test.ts src/packaging/quality-evidence-script.test.ts --testNamePattern "quality"
• corepack pnpm --silent evidence:quality | node -e '...'
• node dist/cli/index.js quality-evidence | sed -n '22,55p'
• corepack pnpm test
• corepack pnpm lint
• corepack pnpm build
• corepack pnpm pack:dry-run
• git diff --check