[thedogwiththedataonit]

Follow-up to GetBrew/brew-v2#2225 (merged and deployed 10-23), which added emails.lang: the language of an email's copy, as an ISO 639-1 code or zh-Hans / zh-Hant. Companion PRs: GetBrew/typescript-sdk#81 and GetBrew/docs#350.

The vendored spec and generated types already carry lang on main, and the published @brew.new/sdk 13.3.0 types it. This PR adds the command surface:

• emails generate --lang <code> sends the body lang. If you omit it, Brew detects the language from the finished body.
• emails edit --lang <code> sends the body lang. lang joins the envelope fields, so --lang alone is a free in-place patch: no AI run and no new version. The progress line reads "Setting the language…". A language you set is kept from then on.
• emails edit --clear-lang sends lang: null, which clears a named language so Brew reads it again. It conflicts with --lang (exit 2), mirroring --group-id / --ungroup.
• emails get prints the API row as-is, so lang appears. A test pins this.
• docs/commands/README.md regenerated. README and CHANGELOG (Unreleased) updated.
• Tests match the --subject-line ones: generate --lang, edit lang-only (no generation heartbeat), edit prompt + lang, --clear-lang, the --lang + --clear-lang conflict, and get shows lang. The write tests fail without the command changes.

The flag is not checked against the enum locally. The API's 400 names lang and lists the valid codes.

Checks

• tsc --noEmit, biome check . and docs:commands:check pass.
• vitest run: 706/706 passing, on main at 1daa79f.

🤖 Generated with Claude Code

Confidence Score: 5/5

The PR appears safe to merge after the companion API change is deployed.

Summary

Adds language options to email creation and editing.

• New email designs can use a language chosen by the writer.
• Email writers can set or clear the copy language on existing designs.

No actionable issues found. Tests were inspected, not run. The previous-review guard failed because the merge bases differ, so this review covered the full PR diff.

_{Reviews (2) · Last reviewed commit: "Add --lang and --clear-lang to emails ge..." · Reviewed by Greptile}