TASK METADATA

Target Files: infra/setup/cli.ts, infra/setup/prompts/*.ts, infra/setup/commands/*.ts
Core Objective: Phase 4.1 (CLI Setup Modularization): Decompose the 772-line infra/setup/cli.ts monolith into isolated prompt flows and Cliffy command modules under infra/setup/prompts/ and infra/setup/commands/.
Dependencies: tasks/complete/2026-0825.01.jul.story.arch.monolith-decomposition-roadmap-1845.ph4.md
Additional Important Notes: Must reduce infra/setup/cli.ts to a clean ~60-line router, pass deno check infra/setup.ts, and preserve all CLI subcommands (auth, test, build, compile_proto, dump_compose, spire, secrets, wizard).

Risks:
- Breaking CLI argument parsing or flag inheritance in Cliffy commands if command action handlers are miswired.
Alternatives:
- Leaving 772 lines in cli.ts; rejected because it violates the Single Responsibility Principle and combines UI prompts, network testers, and command routing into one file.

Extract Interactive Prompts (infra/setup/prompts/):
- infra/setup/prompts/auth.ts: promptAuthConfig, promptSpireConfig, promptConfirmation.
- infra/setup/prompts/wizard.ts: runSetupWizard, handleReviewConfigs.
Extract CLI Subcommands (infra/setup/commands/):
- infra/setup/commands/auth.ts: auth command action & setup file generator.
- infra/setup/commands/test.ts: test connection action (handleTestConnection).
- infra/setup/commands/build.ts: build and compile_proto command actions.
- infra/setup/commands/compose.ts: dump_compose and spire command actions.
- infra/setup/commands/secrets.ts: secrets command action.
Refactor infra/setup/cli.ts:
- Keep cli.ts purely as the lightweight Cliffy Command router (~60-80 lines) registering the command modules and executing runCli(args).
Quality Gates & Validation:
- Run deno check infra/setup.ts.
- Run deno fmt infra/ and deno test --allow-all.