docs: dsh 0.1.0-rc.7: streaming ReplayEnvelope protocol, batch image attachment API, reasoningEffort 'low'

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The dsh mirror took a full refresh (fetched 2026-08-18 vs 2026-08-13) that tracks a new CLI release, @deepseek-ai/dsh@0.1.0-rc.7 (published 2026-08-17). This is not doc-only churn: the release lands several interface-level changes across the harness — the LLM streaming replay-state protocol, the attachment service surface, and the plugin config schema — plus a brand-new extension cookbook page. dsh is a developer preview that breaks things without migration paths, so plugin and adapter authors should treat these as potentially breaking.

• Streaming replay-state is now a structured ReplayEnvelope, not opaque JSON. The finish chunk's replayState field (and BlockAssembler.replayState) changed from unknown to a typed envelope holding response-level metadata plus optional per-block entries aligned with the emitted blocks. Assembly prunes content and metadata with a single keep/drop decision (e.g. a max-tokens finish drops tool calls and the matching envelope entries), so stored metadata always describes stored content and the two can't disagree. LLM adapter authors must now emit/consume ReplayEnvelope; an adapter that can't use a stored state degrades that one message to provider-neutral conversion with a diagnostic instead of failing the request.
• ImageAttachmentService gains a batch saveImages() method — validates one ordered image batch before committing any member, returns durable references in exact input order, and never surfaces partial references on storage failure (already-published content-addressed objects may linger until a future retention policy). acp and mcp-client both gained a dependency on the attachment package, so ACP/MCP image flows are the likely consumers.
• reasoningEffort config now accepts 'low' (config-catalog.md), a new valid value for the deployment thinking policy alongside off | high | max.
• New cookbook: adding a settings card — a plugin can now register its own configuration card on the web settings page through a settings.plugin.item slot, joined to a Host-side settingsNamespace. New page is indexed in llms.txt and the extension-cookbook index.
• run_code tool now attaches image-bearing subtool results after the run; tool docs updated to describe images as part of program output.
• Watch item: .metadata.json now flags content/en/news/news251201.md ("DeepSeek-V3.2 Release") as serving the SPA fallback shell — the upstream news page may have been removed or renamed. The mirrored file itself is unchanged for now.
• Minor: snapshot-testing policy extends coverage to the TypeScript and Python SDKs (examples/jsonrpc-agent, scripts/snapshots/python-sdk-single-exe/); the user guide links the DeepSeek API-key page.