feat: add CodeBuddy support + zh README

[studyzy]

Summary

Adds CodeBuddy as a supported host and ships a Simplified Chinese README translation. The two are bundled because the translation documents the new CodeBuddy install section.

Changes

CodeBuddy plugin support

• .codebuddy-plugin/plugin.json — new manifest.
• README.md — install/uninstall section, host list, and command-capable hosts line updated.
• docs/agent-portability.md — CodeBuddy row in the host matrix.
• scripts/check-versions.js, tests/gemini-extension.test.js, tests/hooks-windows.test.js — include the new manifest in the version-pinning and hook-config checks.

Simplified Chinese README

• README.zh.md — community translation aligned with the latest English README (16 agents). Language switcher link added to README.md.

Test notes

• node --test tests/gemini-extension.test.js tests/hooks-windows.test.js → 11/11 pass.
• node scripts/check-versions.js → All 8 version files pinned at 4.8.4. (was 7).

Reference

CodeBuddy hook docs confirm the variable is :
https://www.codebuddy.ai/docs/cli/hooks-guide

[studyzy]

@DietrichGebert could you take a look at this PR when you have a moment? Thanks!

[DietrichGebert]

Thanks for this, and CodeBuddy is a genuinely significant host, so I would like to support it. A few things before it can go in. First, please drop README.zh.md and the .serena/.idea gitignore lines from this PR; they are separate from the CodeBuddy adapter, and I closed the other Chinese README PRs recently, so let us not bundle one in here. Second, can you confirm the plugin.json + codebuddy-hooks.json actually load in CodeBuddy Code, that it reads a .codebuddy-plugin/plugin.json and runs Claude-style SessionStart/UserPromptSubmit hooks with ${CODEBUDDY_PLUGIN_ROOT}? The adapter mirrors our Claude and Codex hook format, which is perfect if CodeBuddy Code is compatible, but I want to be sure it works before shipping. Once it is just the adapter and you have confirmed it loads, I am happy to merge. Thanks for bringing CodeBuddy.

[studyzy]

Thanks for the review! All requested changes have been addressed:

1. README.zh.md — removed from the branch, so this PR is now scoped purely to the CodeBuddy adapter.
2. .serena / .idea gitignore lines — reverted.
3. Plugin loading confirmed — I tested the adapter in a fresh CodeBuddy Code session with an env-dump probe. CodeBuddy Code correctly reads .codebuddy-plugin/plugin.json, fires SessionStart / UserPromptSubmit hooks, and sets both CLAUDE_PLUGIN_ROOT and CODEBUDDY_PLUGIN_ROOT to the plugin root. The published plugin is using this exact configuration and ponytail mode is active with no issues.

Tests pass (node --test tests/gemini-extension.test.js tests/hooks-windows.test.js → 11/11) and node scripts/check-versions.js → all 8 manifests pinned at 4.8.4.

This should be ready to merge. Thanks for maintaining ponytail!