fix(claude): preserve Devin answers with late reasoning signatures

[lidge-jun]

Summary

Carries #6299 by @foxytanuki. When Devin streams the visible answer and then a late reasoning signature, Claude Code could end up with an empty final result. src/claude/devin-output-order.ts holds the answer until the signature order is settled and replays it in the order Claude Code expects. A bounded hold (shared 32 MiB limit) preserves cancellation and overflow error semantics. The maintainer commit translates the new buffering note into the ja, ko, ru and zh-cn Claude Code guides; review had found it only in English.

Supersedes #6299.

Co-authored-by: foxytanuki 45069709+foxytanuki@users.noreply.github.com

Verification

• Independent review of all changed files: no runtime defect; no new credential destination, auth or signature-control regression; retention bounded.
• On current dev: bun test tests/claude-integration/claude-devin-output-order.test.ts tests/test-layout.test.ts tests/ci-workflows/file-size-ratchet.test.ts 33 pass / 0 fail; bun x tsc --noEmit and bun run structure:check pass. The reviewer also ran five related Devin/Claude suites and the guards: 153 pass / 0 fail. The mutation regression failed before snapshot restoration and passed after.
• Translation accuracy checked by an independent reviewer.
• Cross-platform CI for this head is deferred by the owner's instruction to one run on the final dev tip before release.

Checklist

• Scope stays focused and avoids unrelated cleanup.
• Docs or release notes were updated when needed.
• Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-01T02:18:57.260271Z	f90c5c5	PR opened

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📥 Commits

Reviewing files that changed from the base of the PR and between 7ea77aa and f90c5c5.

📒 Files selected for processing (13)

• docs-site/src/content/docs/guides/claude-code.md
• docs-site/src/content/docs/ja/guides/claude-code.md
• docs-site/src/content/docs/ko/guides/claude-code.md
• docs-site/src/content/docs/ru/guides/claude-code.md
• docs-site/src/content/docs/zh-cn/guides/claude-code.md
• scripts/test-layout/layout.json
• src/claude/devin-output-order.ts
• src/server/responses/run-turn-execution.ts
• structure/clients/claude-desktop.md
• structure/providers-and-adapters.md
• structure/transports/byte-accounting.md
• tests/claude-integration/claude-devin-output-order.test.ts
• tests/fixtures/test-layout-expected.json

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[lidge-jun]

Maintainer integration into dev by @lidge-jun. Carries #6299 with a Co-authored-by trailer; review and local evidence in the description. Cross-platform CI for this head is deferred by the owner's instruction to one run on the final dev tip before release; scripts/ci/assert-mergeable-review.sh --maintainer-integration OK at this head.