[Audit] Standardize CLI output: migrate 41 chalk imports to onboarding helpers

[rohitg00]

Problem

The CLI has inconsistent output patterns across 60 command files:

• 41 commands import chalk directly instead of using colors/helpers from onboarding/
• 1,900 raw console.log calls mixed with @clack/prompts output
• Error output uses 3 different methods: console.error(), this.context.stderr.write(), and error() helper

This creates visual inconsistency — some commands show styled clack prompts, others show raw chalk text.

Proposed Solution

1. Replace all direct chalk imports with colors, success(), warn(), error(), step() from onboarding/
2. Replace console.log(chalk.*) with the appropriate helper
3. Replace ora() spinners with the spinner() wrapper from onboarding

Scope

All 41 files in packages/cli/src/commands/ that import chalk directly, including the heaviest:

• memory.ts (1,027 LOC), agent.ts (1,004 LOC), recommend.ts (733 LOC)
• update.ts, translate.ts, publish.ts

Acceptance Criteria

• Zero import chalk in packages/cli/src/commands/
• All user-facing output uses onboarding helpers
• Build passes, no visual regressions