refactor(cli): split install.ts and model-fallback.ts into focused modules

Install pipeline:
- cli-installer.ts, tui-installer.ts, tui-install-prompts.ts
- install-validators.ts

Model fallback:
- model-fallback-types.ts, fallback-chain-resolution.ts
- provider-availability.ts, provider-model-id-transform.ts

src/cli/cli-installer.ts

@@ -0,0 +1,164 @@
+import color from "picocolors"
+import type { InstallArgs } from "./types"
+import {
+  addAuthPlugins,
+  addPluginToOpenCodeConfig,
+  addProviderConfig,
+  detectCurrentConfig,
+  getOpenCodeVersion,
+  isOpenCodeInstalled,
+  writeOmoConfig,
+} from "./config-manager"
+import {
+  SYMBOLS,
+  argsToConfig,
+  detectedToInitialValues,
+  formatConfigSummary,
+  printBox,
+  printError,
+  printHeader,
+  printInfo,
+  printStep,
+  printSuccess,
+  printWarning,
+  validateNonTuiArgs,
+} from "./install-validators"
+
+export async function runCliInstaller(args: InstallArgs, version: string): Promise<number> {
+  const validation = validateNonTuiArgs(args)
+  if (!validation.valid) {
+    printHeader(false)
+    printError("Validation failed:")
+    for (const err of validation.errors) {
+      console.log(`  ${SYMBOLS.bullet} ${err}`)
+    }
+    console.log()
+    printInfo(
+      "Usage: bunx oh-my-opencode install --no-tui --claude=<no|yes|max20> --gemini=<no|yes> --copilot=<no|yes>",
+    )
+    console.log()
+    return 1
+  }
+
+  const detected = detectCurrentConfig()
+  const isUpdate = detected.isInstalled
+
+  printHeader(isUpdate)
+
+  const totalSteps = 6
+  let step = 1
+
+  printStep(step++, totalSteps, "Checking OpenCode installation...")
+  const installed = await isOpenCodeInstalled()
+  const openCodeVersion = await getOpenCodeVersion()
+  if (!installed) {
+    printWarning(
+      "OpenCode binary not found. Plugin will be configured, but you'll need to install OpenCode to use it.",
+    )
+    printInfo("Visit https://opencode.ai/docs for installation instructions")
+  } else {
+    printSuccess(`OpenCode ${openCodeVersion ?? ""} detected`)
+  }
+
+  if (isUpdate) {
+    const initial = detectedToInitialValues(detected)
+    printInfo(`Current config: Claude=${initial.claude}, Gemini=${initial.gemini}`)
+  }
+
+  const config = argsToConfig(args)
+
+  printStep(step++, totalSteps, "Adding oh-my-opencode plugin...")
+  const pluginResult = await addPluginToOpenCodeConfig(version)
+  if (!pluginResult.success) {
+    printError(`Failed: ${pluginResult.error}`)
+    return 1
+  }
+  printSuccess(
+    `Plugin ${isUpdate ? "verified" : "added"} ${SYMBOLS.arrow} ${color.dim(pluginResult.configPath)}`,
+  )
+
+  if (config.hasGemini) {
+    printStep(step++, totalSteps, "Adding auth plugins...")
+    const authResult = await addAuthPlugins(config)
+    if (!authResult.success) {
+      printError(`Failed: ${authResult.error}`)
+      return 1
+    }
+    printSuccess(`Auth plugins configured ${SYMBOLS.arrow} ${color.dim(authResult.configPath)}`)
+
+    printStep(step++, totalSteps, "Adding provider configurations...")
+    const providerResult = addProviderConfig(config)
+    if (!providerResult.success) {
+      printError(`Failed: ${providerResult.error}`)
+      return 1
+    }
+    printSuccess(`Providers configured ${SYMBOLS.arrow} ${color.dim(providerResult.configPath)}`)
+  } else {
+    step += 2
+  }
+
+  printStep(step++, totalSteps, "Writing oh-my-opencode configuration...")
+  const omoResult = writeOmoConfig(config)
+  if (!omoResult.success) {
+    printError(`Failed: ${omoResult.error}`)
+    return 1
+  }
+  printSuccess(`Config written ${SYMBOLS.arrow} ${color.dim(omoResult.configPath)}`)
+
+  printBox(formatConfigSummary(config), isUpdate ? "Updated Configuration" : "Installation Complete")
+
+  if (!config.hasClaude) {
+    console.log()
+    console.log(color.bgRed(color.white(color.bold(" CRITICAL WARNING "))))
+    console.log()
+    console.log(color.red(color.bold("  Sisyphus agent is STRONGLY optimized for Claude Opus 4.5.")))
+    console.log(color.red("  Without Claude, you may experience significantly degraded performance:"))
+    console.log(color.dim("    • Reduced orchestration quality"))
+    console.log(color.dim("    • Weaker tool selection and delegation"))
+    console.log(color.dim("    • Less reliable task completion"))
+    console.log()
+    console.log(color.yellow("  Consider subscribing to Claude Pro/Max for the best experience."))
+    console.log()
+  }
+
+  if (
+    !config.hasClaude &&
+    !config.hasOpenAI &&
+    !config.hasGemini &&
+    !config.hasCopilot &&
+    !config.hasOpencodeZen
+  ) {
+    printWarning("No model providers configured. Using opencode/glm-4.7-free as fallback.")
+  }
+
+  console.log(`${SYMBOLS.star} ${color.bold(color.green(isUpdate ? "Configuration updated!" : "Installation complete!"))}`)
+  console.log(`  Run ${color.cyan("opencode")} to start!`)
+  console.log()
+
+  printBox(
+    `${color.bold("Pro Tip:")} Include ${color.cyan("ultrawork")} (or ${color.cyan("ulw")}) in your prompt.\n` +
+      `All features work like magic—parallel agents, background tasks,\n` +
+      `deep exploration, and relentless execution until completion.`,
+    "The Magic Word",
+  )
+
+  console.log(`${SYMBOLS.star} ${color.yellow("If you found this helpful, consider starring the repo!")}`)
+  console.log(
+    `  ${color.dim("gh api --silent --method PUT /user/starred/code-yeongyu/oh-my-opencode >/dev/null 2>&1 || true")}`,
+  )
+  console.log()
+  console.log(color.dim("oMoMoMoMo... Enjoy!"))
+  console.log()
+
+  if ((config.hasClaude || config.hasGemini || config.hasCopilot) && !args.skipAuth) {
+    printBox(
+      `Run ${color.cyan("opencode auth login")} and select your provider:\n` +
+        (config.hasClaude ? `  ${SYMBOLS.bullet} Anthropic ${color.gray("→ Claude Pro/Max")}\n` : "") +
+        (config.hasGemini ? `  ${SYMBOLS.bullet} Google ${color.gray("→ OAuth with Antigravity")}\n` : "") +
+        (config.hasCopilot ? `  ${SYMBOLS.bullet} GitHub ${color.gray("→ Copilot")}` : ""),
+      "Authenticate Your Providers",
+    )
+  }
+
+  return 0
+}