feat(next-steps): a language option for the suggestions

[ssimu]

Why

next-steps always writes its suggestions in English. Working in another language, you read each line, translate it in your head, and only then decide whether it is what you meant to type next. That costs more than just writing the prompt yourself, so the band stops earning its place.

What

A language user config. Set it, and the model writes the lines in that language.

Write every line in ${language}. Keep file names, commands and code identifiers as they are.

• Empty is the default, and then the clause is not added at all — the English behaviour is unchanged byte for byte.
• Names stay as they are. A drafted prompt is only useful if you can send it; signup.ts translated is not. The second sentence of the clause is what keeps a suggestion pasteable.

Changes

File
hooks/register.tsx	register(on, options), one conditional clause on the system prompt
.claude-plugin/plugin.json	userConfig.language, version 0.1.1 → 0.2.0
.claude-plugin/marketplace.json	version bump
README.md, docs/mods.md	one line each, in the style of the other mods' settings
tests/next-steps.test.ts	2 tests

Checks

• claude plugin validate mods/next-steps → passed
• CLAUDE_CONFIG_DIR=$(mktemp -d) claude plugin test mods/next-steps → 18 pass, 0 fail (16 existing + 2)
• Verified the new tests are load-bearing: replacing the language guard with false fails one and leaves the other 17 green

The test helper now records the system prompt the mod sends, so both the new tests assert on what the model is actually asked, not on a flag.

Note

Used in Korean day to day, which is where this came from.