docs(blog): polish serverless agent runtimes article

[Astro-Han]

Summary

Follow-up polish for the Serverless Agent Runtime blog (#4838):

• Strictly retain the original technical definitions, systems boundaries, and architectural comparisons across OpenSandbox, CubeSandbox, and Agent Substrate.
• Refine prose style across both docs/blogs/serverless-agent-runtime.zh-CN.md and docs/blogs/serverless-agent-runtime.md:
  • Replace repetitive formulaic "不是……而是……" / "not X, but Y" negation-first contrasts with direct, authoritative systems descriptions.
  • Remove informal phrasing and rhetorical filler while preserving every qualifying note and citation.
  • Maintain 0 em-dashes across both Chinese and English prose.
• Preserve 100% line-by-line mirror parity (367 lines in each file) and exact footnote references.

Refs #4838

Verification

• git diff --check origin/main...HEAD (clean)
• npm run check:asf-headers (clean)
• Verified 0 em-dashes and 0 formulaic contrast patterns across both markdown documents.
• Automated tests were not run because this is a documentation-only wording refinement.

AI use

Select exactly one:

• No generative tool made a substantive contribution
• Generative tooling made a substantive contribution

Tool(s) and scope:

• Gemini: Assisted with editorial polish, style check verification, and bilingual line parity alignment.

Checklist

• Tests cover the change and fail without it
• Lint, format, typecheck and the affected suites pass locally

Does this PR entail a change in behavior?

• Yes — described under Summary above
• No

[Astro-Han]

Reviewed current head 4dd45963ab4b7d08471e8478b4383b17599655f3 (OPEN, MERGEABLE/BLOCKED awaiting human review). One P2 plus two P3s below, no P0/P1. Docs-only public content (the .md plus its .zh-CN.md, parallel changes both sides); checks green on this head.

P2 — the "this article does not rank the three projects" neutrality statement was deleted, in both languages

Before: "This article does not attempt to rank the three projects. Instead, it uses them to examine how Agent Runtimes are reshaping Serverless." / "本文不打算给三个项目打分，而是借它们理解 Agent Runtime 正在怎样改写 Serverless." After: "This essay analyzes how these three architectures navigate systems trade-offs and reframe the design boundaries of Serverless for Agent Runtimes." The explicit neutrality stance is gone in both files (searched: no rank/打分/排名/优劣 anywhere after) — a consistent, deliberate deletion, not an omission. Why a human should decide: the article publicly names three real third-party projects (OpenSandbox, CubeSandbox, Agent Substrate). That sentence was a posture statement — "we are not ranking". Without it, the piece reads from "using three examples to explain principles" as "analyzing three architectures' trade-offs", and readers are likelier to read the comparisons as evaluations. No disparaging language appears, so this is not a content problem — it is a public-positioning question, beyond what a reviewer should decide for the author. If deliberately cut, fine — flagged so it is seen; if lost in the rewrite, consider restoring.

P3s (non-blocking)

• One rewrite changes meaning, in the core definition paragraph: "when the work is done, the caller no longer owns that machine" → "when demand ceases, the caller releases the underlying machine". "No longer owns" is passive/platform-driven; "releases" implies the caller performs a release action — while the whole point of Serverless is that the caller does nothing. Same paragraph shortens resource execution contract to resource contract, dropping a meaningful qualifier (it governs execution-time binding, not resources in general).
• Overall terminology density rose noticeably (e.g. multi-tenant scheduling → multi-tenant bin-packing). Whether that counts as "polish" is a human call.

What I could not judge

The 84 changed Chinese lines were structurally checked only, not line-by-line against the English — the P3s above rest on the English version; whether the Chinese carries matching drift needs a dedicated pass.

---

Automated review notice: This comment was posted by an automated review agent operated by Astro-Han. It is not an independent human review and does not replace one.

简体中文

本条结论全部来自 @Opus-Qronos-AstroHan 的审查。我自己没有读这份 diff；我核的是当前 head 有没有漂移。当前 head 是 4dd4596，未关闭。纯文档润色，一条 P2：删掉的"不打分"中立声明该由人定夺不该代定，另有两条小的措辞提醒。等人类拍板。