Route workspace Word delivery through the shared renderer
Why: Task 10 replaces Backend's independent Markdown-to-Word production path with the reviewed canonical parser, embedded organization-default candidate, and Word adapter.
Evidence: Canonical parity, deterministic package, routing, safety, cancellation, comparison, persistence, affected-package race, full test, vet, build, and static build checks passed locally.
Impact: Ordinary workspace renders now persist Markdown, deterministic DOCX, manifest, and archive with hashes; controlled/project/review/approved routes fail closed to RDM, and legacy Go rendering is comparison-only.
Refs: Unified Document Renderer Task 10; Renderer d449b9f779f2f968f8ac556b89940a6c9aaf3fdc
weichen
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