[ziqifan617]

Summary

Add a public-source SGLang HiCache/KVCR quick start with a separate Dockerfile, alongside the vLLM guide and image.

• Build KVCR from the local Docker build-context checkout, including local source changes, rather than fetching a separate KVCR revision.
• Pin SGLang #45647 at b0506add3eac49bbb2c303e83169ea19c907fb98 and Dynamo at 83ea37e849e883c27d7ed848e0f329961e1fb173.
• Run the state agent and publish KVCR-owned inventory for router-guided peer delivery; verify completed delivery, destination reuse, and matching output tokens. No KVCR production-code changes.
• After this PR merges, the guide clones the default branch, so the KVCR build context includes changes already merged to main, including Perf: serve ready local DRAM sources without the core state lock #148.

Validation

• Built the SGLang quick-start Dockerfile from KVCR PR checkout d186752ce78092aa2bd0cc4c1d48d24a1c247354, SGLang b0506add3eac49bbb2c303e83169ea19c907fb98, and Dynamo 83ea37e849e883c27d7ed848e0f329961e1fb173. KVCR 0.2.0 was built from the checkout and the image's import/version checks passed. The unchanged Dockerfile was built with BuildKit; this was not a GPU inference test.
• With the earlier SGLang 0d37a2bf4db3521a876d1b450a884b91c0e334c9 and KVCR 7b7743fe0104393ac56c6fe83ae58387268dc72b source pair, a custom two-worker Qwen3-32B GPU test verified cross-node peer delivery, 115,968 restored tokens, and matching output IDs. This was not the guide-as-written Qwen3-0.6B test.
• The earlier SGLang 4a083003f9393b758077afe9bbce3f6b1c64f790 and KVCR 7186e7c20ba6e4d71ac3aff507fac9bfd83e8a07 pair passed the public-source Qwen3-0.6B two-worker check: 1,984/2,048 peer-reused tokens, matching 16 output token IDs, and 31 blocks / 62 spans with no failed keys.
• GPU end-to-end validation of the current b0506add SGLang pin together with the post-merge KVCR main containing Perf: serve ready local DRAM sources without the core state lock #148 remains pending. Do not infer that validation from the successful image build or earlier source-pair runs.

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