docs(plan): Plan 1C-γ₁ — attachments + Document type implementation
11 tasks, ~10 commits. Bottom-up layering:
- T1: tighten AttachmentCaps type
- T2: GitHost interface extension (putBlob/getBlob/deleteBlob)
- T3: GitHubHost impl with Git Data API fallback + tests
- T4: GiteaHost impl + tests
- T5: SW vault helpers (addAttachmentToItem, removeAttachmentsFromItem)
- T6: SW router handlers (upload/download_attachment) + tests
- T7: shared attachments-disclosure component + CSS + tests
- T8: wire disclosure into 6 type forms + 📎 list indicator
- T9: Document type form + signature-block detail + CSS + tests
- T10: dispatcher routes Document
- T11: build + verify + manual smoke
Test count target: 145 (was 128 + ~17 new across git-host, router,
disclosure, document.save).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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