feature/project-inbox-r1
main
CF3(D48-D51)文档侧:usage.md 4.2 项目收件箱条目(留档/聚合口径/两级角标)。配套 core #11/#12、backend、ui、frontend PR 与 Dev gitlink PR。
Why: D48-D51 add the project inbox (archive-to-project, aggregated project view, project stream); guide needs the user-facing story. Evidence: usage.md 4.2 gains project inbox bullet; badge note updated. Impact: docs-only. Refs: 2026-09-30-card-stream-artifact-unify-project-inbox.md (D48-D52).
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CF3(D48-D51)文档侧:usage.md 4.2 项目收件箱条目(留档/聚合口径/两级角标)。配套 core #11/#12、backend、ui、frontend PR 与 Dev gitlink PR。