[hsuchifeng]

Summary

• add DAG dependencies, conditions, join and failure/recovery propagation
• add restricted expressions and templates without eval, with command inputs passed only through env: mappings
• add file and inline sub-workflows, inputs, outputs, and named ends with namespace-aware resolution
• validate missing references, cycles, recursion, unreachable steps, outputs, and ends per workflow file
• update the English and Chinese workflow guides

Closes #1078

Testing

• npm run build
• npx tsc --noEmit
• npm run lint
• npx vitest run src/__tests__/workflow-*.test.ts (73 tests passed)
• npx vitest run commands-reference -u
• npm run test:e2e -- src/__tests__/workflow-subworkflow-e2e.test.ts (real CLI file sub-workflow E2E passed)

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