feature/card-stream-r1
main
CF-S(D44/D45)文档侧:usage.md 卡流条目更新为流式三段式流程(card_begin/card_append/card_commit)与 run 终止兜底语义。配套 backend PR 与 Dev gitlink PR。
Why: CF-S (D44/D45) adds card_begin/card_append/card_commit; users need the streaming flow and crash-fallback behavior documented. Evidence: usage.md cardflow bullet updated to v2 flow. Impact: docs-only. Refs: 2026-09-30-card-stream-artifact-unify-project-inbox.md (D44/D45).
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CF-S(D44/D45)文档侧:usage.md 卡流条目更新为流式三段式流程(card_begin/card_append/card_commit)与 run 终止兜底语义。配套 backend PR 与 Dev gitlink PR。