feat(cli): integrate legacy config migration into write-omo-config

Update writeOmoConfig to detect and migrate legacy config files before
writing. Adds logic to handle oh-my-opencode.json -> oh-my-openagent.json
migration with proper path resolution and fallback handling.

🤖 Generated with assistance of OhMyOpenCode

src/cli/config-manager/write-omo-config.test.ts

@@ -4,6 +4,7 @@ import { tmpdir } from "node:os"
 import { join } from "node:path"
 
 import { parseJsonc } from "../../shared/jsonc-parser"
+import { CONFIG_BASENAME, LEGACY_CONFIG_BASENAME } from "../../shared/plugin-identity"
 import type { InstallConfig } from "../types"
 import { resetConfigContext } from "./config-context"
 import { generateOmoConfig } from "./generate-omo-config"
@@ -35,7 +36,7 @@ describe("writeOmoConfig", () => {
 
   beforeEach(() => {
     testConfigDir = join(tmpdir(), `omo-write-config-${Date.now()}-${Math.random().toString(36).slice(2)}`)
-    testConfigPath = join(testConfigDir, "oh-my-opencode.json")
+    testConfigPath = join(testConfigDir, `${CONFIG_BASENAME}.json`)
 
     mkdirSync(testConfigDir, { recursive: true })
     process.env.OPENCODE_CONFIG_DIR = testConfigDir
@@ -78,4 +79,21 @@ describe("writeOmoConfig", () => {
       expect(savedConfig).toHaveProperty(defaultKey)
     }
   })
+
+  it("migrates a legacy config file to the canonical basename before writing", () => {
+    // given
+    const legacyConfigPath = join(testConfigDir, `${LEGACY_CONFIG_BASENAME}.json`)
+    const canonicalConfigPath = join(testConfigDir, `${CONFIG_BASENAME}.json`)
+    writeFileSync(legacyConfigPath, JSON.stringify({ disabled_hooks: ["comment-checker"] }, null, 2) + "\n", "utf-8")
+
+    // when
+    const result = writeOmoConfig(installConfig)
+
+    // then
+    expect(result.success).toBe(true)
+    expect(result.configPath).toEndWith(canonicalConfigPath)
+
+    const savedConfig = parseJsonc<Record<string, unknown>>(readFileSync(canonicalConfigPath, "utf-8"))
+    expect(savedConfig.disabled_hooks).toEqual(["comment-checker"])
+  })
 })

src/cli/config-manager/write-omo-config.ts

@@ -1,5 +1,9 @@
 import { existsSync, readFileSync, statSync, writeFileSync } from "node:fs"
+import { basename, dirname, extname, join } from "node:path"
+
 import { parseJsonc } from "../../shared"
+import { migrateLegacyConfigFile } from "../../shared/migrate-legacy-config-file"
+import { CONFIG_BASENAME, LEGACY_CONFIG_BASENAME } from "../../shared/plugin-identity"
 import type { ConfigMergeResult, InstallConfig } from "../types"
 import { backupConfigFile } from "./backup-config"
 import { getConfigDir, getOmoConfigPath } from "./config-context"
@@ -23,7 +27,14 @@ export function writeOmoConfig(installConfig: InstallConfig): ConfigMergeResult
     }
   }
 
-  const omoConfigPath = getOmoConfigPath()
+  const detectedConfigPath = getOmoConfigPath()
+  const canonicalConfigPath = join(dirname(detectedConfigPath), `${CONFIG_BASENAME}${extname(detectedConfigPath) || ".json"}`)
+  const shouldMigrateLegacyPath = basename(detectedConfigPath).startsWith(LEGACY_CONFIG_BASENAME)
+  const omoConfigPath = shouldMigrateLegacyPath
+    ? ((migrateLegacyConfigFile(detectedConfigPath) || existsSync(canonicalConfigPath))
+        ? canonicalConfigPath
+        : detectedConfigPath)
+    : detectedConfigPath
 
   try {
     const newConfig = generateOmoConfig(installConfig)
@@ -71,7 +82,7 @@ export function writeOmoConfig(installConfig: InstallConfig): ConfigMergeResult
     return {
       success: false,
       configPath: omoConfigPath,
-      error: formatErrorWithSuggestion(err, "write oh-my-opencode config"),
+      error: formatErrorWithSuggestion(err, `write ${CONFIG_BASENAME} config`),
     }
   }
 }