attachment/ - durable attachment capability family

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The durable binary attachment seam and its local filesystem implementation. Both are product packages.

Package	Role	ctx key
attachment/	Immutable attachment references, image limits, and storage service	ctx.attachments
attachment-local/	Content-addressed private storage below DSH_HOME	(registers on ctx.attachments)

Unsent browser drafts are intentionally outside this capability. Bytes enter durable storage only when a user prompt is submitted or when a provider adapter commits structured model output.