feat(new-setup): add probe step for dynamic context injection

Single upfront parallel scan the SKILL.md renders via `!`...`` so Claude
sees system state before generating its first response. Each field maps
to a routing decision (skip/run/ask) for a downstream step.

Reports: OS, SHELL, DOCKER + IMAGE_PRESENT, ONECLI_STATUS + ONECLI_URL,
ANTHROPIC_SECRET, SERVICE_STATUS, CLI_AGENT_WIRED, INFERRED_DISPLAY_NAME,
TZ_STATUS + TZ_ENV + TZ_SYSTEM. Runs in ~200ms on a fully-set-up host.

Not a replacement for per-step idempotency — each step keeps its own
checks since probe is a snapshot and can go stale by execution time.

Uses /api/health (OneCLI's actual endpoint). Anthropic secret check
uses the CLI client so it works whenever onecli is installed, even if
the direct HTTP health probe fails (different network paths).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

setup/index.ts

@@ -19,6 +19,7 @@ const STEPS: Record<
   onecli: () => import('./onecli.js'),
   auth: () => import('./auth.js'),
   'cli-agent': () => import('./cli-agent.js'),
+  probe: () => import('./probe.js'),
 };
 
 async function main(): Promise<void> {