feature/artifact-unify-r1
main
CF-A(D46/D47)文档侧:usage.md 4.5 工件节增门面卡与上下文回填说明。配套 backend PR 与 Dev gitlink PR。
Why: D46/D47 add inbox facade cards for truncated tool results and artifact text backfill; guide needs the unified presentation story. Evidence: usage.md 4.5 gains facade/backfill bullet. Impact: docs-only. Refs: 2026-09-30-card-stream-artifact-unify-project-inbox.md (D46/D47).
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CF-A(D46/D47)文档侧:usage.md 4.5 工件节增门面卡与上下文回填说明。配套 backend PR 与 Dev gitlink PR。