refactor: extract duplicated prompt, JSON, file-write, and exec patterns into shared utils

[devin-ai-integration]

Checklist

• I have read the Contributor Guide
• I have read and agree to the Code of Conduct
• I have added a description of my changes and why I'd like them included in the section below

Description of Changes

Four patterns were copy-pasted across commands/plugins/utils; each is now a single utility. Net -105 lines, no behavior change other than error output now going through the logger (✖ Error: ...) instead of raw console.error.

utils/inquirer/prompts.ts — three duplicated inquirer shapes:

• selectOption({ message, options, name, invalidMessage }) replaces the identical list-prompt + options.find(o => o.name === answers[name]) + invalid-selection error in deploy.ts, auth.ts, database.ts.
• confirmPrompt(message, { default, prefix }) replaces four hand-rolled type: 'confirm' prompts (ask-open-page.ts, check-git.ts, and two in kinde.ts).
• promptRequiredInput({ message, emptyMessage, password }) replaces the two non-empty-validator prompts in mongoose.ts.

deploy.ts and init.ts also drop their .then().catch() promise chains for async/await + a single try/catch, matching auth.ts/database.ts.

utils/fs/json-file.ts — readJsonFile<T> / writeJsonFile replace read+parse+JSON.stringify(x, null, 2)+write blocks in install-plugins.ts, prettier.ts, read-config-file.ts, init.ts.

utils/fs/write-project-file.ts — writeProjectFile(relativePath, content, { projectPath, mode }) replaces fs.writeFileSync(path.join(process.cwd() | projectPath, ...), content, { encoding: 'utf8' }) in eslint.ts, prettier.ts, jest.ts, husky.ts, init.ts, selectGitHubTemplate.ts. It mkdir -ps the parent, which subsumes husky's manual .husky dir creation.

utils/exec.ts — runCommand(cmd, options) (defaults stdio: 'inherit') replaces the private runCmd in package-manager.ts and the scattered execSync(cmd, { stdio: 'inherit' }) calls in init.ts, husky.ts, setup-git-repo.ts.

logFailure(text, error) in utils/logger.ts replaces ~8 console.error('Failed to X:', error) sites so CLI errors are formatted consistently.

_template/ and COMMAND_TEMPLATE/ are intentionally untouched — they are standalone scaffolding examples.

Verified with npx tsc --noEmit, npm run lint src, npm run build.

Related Issues

None

Link to Devin session: https://app.devin.ai/sessions/00fcd088d0e545abb8332fc70ef5bb93
Requested by: @lox-bot

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