chore: prepare v3.56.0 release

[edelauna]

Summary

• Bump version to 3.56.0 in src/package.json
• Generate CHANGELOG.md with all 22 PRs merged since v3.54.1 (excluding what shipped in 3.55.0 and 3.55.1)
• Update root README.md and all 17 localized locales/*/README.md files with v3.56.0 What's New section
• Update in-app announcement highlights in webview-ui/src/i18n/locales/*/chat.json (all 18 locales)
• Update latestAnnouncementId in src/core/webview/ClineProvider.ts

Highlights

• Claude Opus 4.8 support across Anthropic, Bedrock, and Vertex providers (PR feat: add Claude Opus 4.8 support across Anthropic, Bedrock, and Vertex providers #386)
• Opencode Go added as a new first-class API provider (PR feat(opencode-go): add Opencode Go as a first-class provider (#172) #319)
• Reliable task cancellation — cancelling a task now terminates the running process, with automatic Ctrl+C retry for stubborn processes (PRs fix(terminal): terminate running process when task is cancelled (#245) #261, fix(terminal): retry Ctrl+C for processes needing multiple SIGINT (#266) #272)

Test plan

• Confirm src/package.json version is 3.56.0
• Confirm CHANGELOG.md 3.56.0 section lists all expected PRs with no duplicates
• Confirm announcement shows on first launch after install (new latestAnnouncementId)
• Spot-check one or two localized READMEs for correct v3.56.0 What's New content
• Let release validation workflow and normal PR checks pass before merge

Summary by CodeRabbit

• New Features

  • Added Claude Opus 4.8 support across Anthropic, Bedrock, and Vertex providers.
  • Introduced Opencode Go as a first-class API provider.
  • Improved task cancellation—terminal processes now properly terminate when cancelled instead of hanging.

• Bug Fixes

  • Fixed Gemini custom model ID handling.
  • Corrected Grok diff truncation issues.
  • Fixed Windows PowerShell detection when no profile exists.
  • Improved Vertex AI credential field validation warnings.
  • Enhanced VS Code code action localization and naming.

• Documentation

  • Updated release notes and localization across 15+ languages.
  • Multiple security dependency updates.

[coderabbitai]

📝 Walkthrough

Walkthrough

Release version v3.56.0 updates package metadata, version constant, core changelog, main README, and 34 localized documentation and announcement files to reflect announced features including Claude Opus 4.8, Opencode Go first-class provider, reliable task cancellation, and multiple provider and editor bug fixes.

Changes

Release v3.56.0 Documentation and Metadata Update

Layer / File(s)	Summary
Version metadata and announcement ID update src/package.json, src/core/webview/ClineProvider.ts	Version field bumped from 3.55.1 to 3.56.0; latestAnnouncementId updated to the new May 2026 v3.56.0 announcement identifier.
Core release notes and changelog CHANGELOG.md, README.md	CHANGELOG.md adds comprehensive v3.56.0 "Minor Changes" entry with provider/model additions, feature updates, bug fixes, and dependency security bumps. README.md "What's New" section replaced with v3.56.0 content listing feature support and reliability improvements.
Localized README release notes locales/ca/README.md, locales/de/README.md, locales/es/README.md, locales/fr/README.md, locales/hi/README.md, locales/id/README.md, locales/it/README.md, locales/ja/README.md, locales/ko/README.md, locales/nl/README.md, locales/pl/README.md, locales/pt-BR/README.md, locales/ru/README.md, locales/tr/README.md, locales/vi/README.md, locales/zh-CN/README.md, locales/zh-TW/README.md	Release notes section updated across 16 localized README files, replacing v3.55.1 hotfix descriptions with v3.56.0 feature and fix bullets covering new providers, task cancellation improvements, Gemini/Grok/PowerShell/VS Code/Vertex corrections, and dependency security updates.
Localized announcement highlights webview-ui/src/i18n/locales/ca/chat.json, webview-ui/src/i18n/locales/de/chat.json, webview-ui/src/i18n/locales/en/chat.json, webview-ui/src/i18n/locales/es/chat.json, webview-ui/src/i18n/locales/fr/chat.json, webview-ui/src/i18n/locales/hi/chat.json, webview-ui/src/i18n/locales/id/chat.json, webview-ui/src/i18n/locales/it/chat.json, webview-ui/src/i18n/locales/ja/chat.json, webview-ui/src/i18n/locales/ko/chat.json, webview-ui/src/i18n/locales/nl/chat.json, webview-ui/src/i18n/locales/pl/chat.json, webview-ui/src/i18n/locales/pt-BR/chat.json, webview-ui/src/i18n/locales/ru/chat.json, webview-ui/src/i18n/locales/tr/chat.json, webview-ui/src/i18n/locales/vi/chat.json, webview-ui/src/i18n/locales/zh-CN/chat.json, webview-ui/src/i18n/locales/zh-TW/chat.json	Release announcement highlight1, highlight2, highlight3 strings replaced across 18 localized chat.json files with new messaging: Claude Opus 4.8 and Opencode Go support, improved task cancellation with reliable process termination and automatic Ctrl+C retry for stubborn processes, and consolidated provider/editor fixes (Gemini custom model IDs, Grok diff truncation, PowerShell detection on Windows, VS Code code action branding).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• Zoo-Code-Org/Zoo-Code#261: The "terminate-process-on-cancel" changeset corresponds to the TerminalRegistry fix that aborts running terminal processes on task cancellation, resolving the stuck "busy" state issue.

Suggested reviewers

• hannesrudolph
• taltas
• JamesRobert20

Poem

🐰 From version's prior state so low,
We hop to v3.56.0 in a row!
Claude Opus gleams, and Go appears,
Tasks cancel cleanly—say goodbye to fears.
Release notes sing in every tongue,
A global chorus, newly sung! 🌍

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description is missing critical required sections from the template: Related GitHub Issue, Test Procedure, Pre-Submission Checklist, and Screenshots/Videos sections are absent.	Add the missing required template sections: link to the approved GitHub Issue, provide detailed test procedures for reviewers to verify the changes, complete the pre-submission checklist, and include relevant documentation notes.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The PR title 'chore: prepare v3.56.0 release' accurately describes the main change: preparing release artifacts and version bumps for v3.56.0.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/v3.56.0

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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