fix(doctor): oMoMoMoMo branding, remove providers check, fix comment-checker detection

Rename header to oMoMoMoMo Doctor to match installation guide branding.
Remove providers check entirely — no longer meaningful for diagnostics.
Fix comment-checker detection by resolving @code-yeongyu/comment-checker package path
in addition to PATH lookup.

src/cli/doctor/format-status.ts

@@ -7,7 +7,7 @@ export function formatStatus(result: DoctorResult): string {
 
   lines.push(formatHeader())
 
-  const { systemInfo, providers, tools } = result
+  const { systemInfo, tools } = result
   const padding = " "
 
   const opencodeVer = systemInfo.opencodeVersion ?? "unknown"
@@ -19,12 +19,6 @@ export function formatStatus(result: DoctorResult): string {
   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)