doc[notask]: simplify SDK family architecture diagrams

[yuranich]

🎯 What problem does this PR solve?

• The published SDK architecture diagrams were too dense: the same package mesh, transport matrix, and model-source story was repeated on every C4 page.
• Labels did not match the planned split: @qvac/sdk is the host and worker shell, @qvac/inference is the engine the worker runs, registry bytes are not HTTP, and several domain fields were stale.

📝 How does it solve it?

• Collapse system context to one SDK family plus registry, HTTP/CDN, and Holepunch.
• Show the target runtime path Host Client → Bare Worker (RPC shell) → @qvac/inference, with direct Bare skipping the worker.
• Keep two deployment topologies. Left is host plus worker (subprocess on Node/Python/Electron, same process on Pear and Expo). Right is direct Bare. Platform transports stay in a table.
• Correct registry vs HTTP, model-source kinds, dispatch lookup, and domain names (blobCoreKey, workspace, events/final) without adding boxes.
• Label wire edges as intent [transport]. Registry catalog and blobs use Holepunch (Hyperswarm plus a Hypercore blob store). HTTPS and Hyperswarm stay on their own edges.

🧪 How was it tested?

• Rendered PlantUML sources to PNG with the architecture render script and reviewed the images.

[github-actions]

Review Status

Current Status: ❌ PENDING
Approvals so far: none

Pending reviews: Needs 1 Management or Team Lead, and 1 more from Management, Team Lead, or Member.

[github-actions]

License compliance — clean

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Updated automatically by the canonical license compliance workflow.

NOTICE presence (advisory)

Missing NOTICE (advisory, does not block):

• ./.github/actions/release-merge-guard
• ./docs/website
• ./packages/ggml-coload-smoke
• ./packages/fabric/test/integration
• ./packages/inference-addon-cpp/mobile
• ./packages/sdk/e2e
• ./packages/llm-llamacpp/benchmarks/performance
• ./packages/llm-llamacpp/benchmarks/server
• ./packages/vla-ggml/sim/server
• ./packages/embed-llamacpp/benchmarks/performance
• ./packages/embed-llamacpp/benchmarks/server
• ./packages/asr-ggml/benchmarks/server