[Audit] Add loading spinners to 43 commands missing progress feedback

[rohitg00]

Problem

43 out of 60 commands have no spinner or progress indicator. Users see no feedback during potentially long operations — the CLI appears frozen.

Commands Missing Spinners

High-priority (perform I/O or network):

• translate — converts between agent formats, can be slow for large skills
• publish — submits to marketplace
• scan — security scanning
• agent (all subcommands) — agent detection, installation
• remove — filesystem operations
• sync — syncs across agents
• memory — 1,027 LOC, reads/writes state
• mesh — network operations

Medium-priority:

• list, activity, context, session, learn, team, plugin
• agents-md, audit, cicd, command, create, doctor

Proposed Solution

Import spinner from onboarding/ and wrap I/O-heavy sections:

const s = spinner();
s.start('Translating skill...');
// ... work ...
s.stop('Translation complete');

Acceptance Criteria

• All commands that perform I/O have spinner feedback
• Spinners are suppressed in --quiet and --json modes
• Build passes