refactor(doctor): redesign with 3-tier output and consolidated checks

Consolidate 16 separate checks into 5 (system, config, providers, tools, models).
Add 3-tier formatting: default (problems-only), --status (dashboard), --verbose (deep diagnostics).
Read actual loaded plugin version from opencode cache directory.
Check environment variables for provider authentication.

src/cli/doctor/format-status.ts

@@ -0,0 +1,41 @@
+import color from "picocolors"
+import type { DoctorResult } from "./types"
+import { formatHeader, formatStatusMark } from "./format-shared"
+
+export function formatStatus(result: DoctorResult): string {
+  const lines: string[] = []
+
+  lines.push(formatHeader())
+
+  const { systemInfo, providers, tools } = result
+  const padding = " "
+
+  const opencodeVer = systemInfo.opencodeVersion ?? "unknown"
+  const pluginVer = systemInfo.pluginVersion ?? "unknown"
+  const bunVer = systemInfo.bunVersion ?? "unknown"
+  lines.push(` ${padding}System     ${opencodeVer} · ${pluginVer} · Bun ${bunVer}`)
+
+  const configPath = systemInfo.configPath ?? "unknown"
+  const configStatus = systemInfo.configValid ? color.green("(valid)") : color.red("(invalid)")
+  lines.push(` ${padding}Config     ${configPath} ${configStatus}`)
+
+  const providerParts = providers.map((p) => {
+    const mark = formatStatusMark(p.available)
+    return `${p.name}${mark}`
+  })
+  lines.push(` ${padding}Providers  ${providerParts.join("  ")}`)
+
+  const lspText = `LSP ${tools.lspInstalled}/${tools.lspTotal}`
+  const astGrepMark = formatStatusMark(tools.astGrepCli)
+  const ghMark = formatStatusMark(tools.ghCli.installed && tools.ghCli.authenticated)
+  const ghUser = tools.ghCli.username ?? ""
+  lines.push(` ${padding}Tools      ${lspText} · AST-Grep ${astGrepMark} · gh ${ghMark}${ghUser ? ` (${ghUser})` : ""}`)
+
+  const builtinCount = tools.mcpBuiltin.length
+  const userCount = tools.mcpUser.length
+  const builtinText = builtinCount > 0 ? tools.mcpBuiltin.join(" · ") : "none"
+  const userText = userCount > 0 ? `+ ${userCount} user` : ""
+  lines.push(` ${padding}MCPs       ${builtinText} ${userText}`)
+
+  return lines.join("\n")
+}