fix(migration): stop task_system backup writes (#1561)

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/shared/migration/config-migration.ts

@@ -0,0 +1,112 @@
+import * as fs from "fs"
+import { log } from "../logger"
+import { AGENT_NAME_MAP, migrateAgentNames } from "./agent-names"
+import { migrateHookNames } from "./hook-names"
+import { migrateModelVersions } from "./model-versions"
+
+export function migrateConfigFile(
+  configPath: string,
+  rawConfig: Record<string, unknown>
+): boolean {
+  let needsWrite = false
+
+  // Load previously applied migrations
+  const existingMigrations = Array.isArray(rawConfig._migrations)
+    ? new Set(rawConfig._migrations as string[])
+    : new Set<string>()
+  const allNewMigrations: string[] = []
+
+  if (rawConfig.agents && typeof rawConfig.agents === "object") {
+    const { migrated, changed } = migrateAgentNames(rawConfig.agents as Record<string, unknown>)
+    if (changed) {
+      rawConfig.agents = migrated
+      needsWrite = true
+    }
+  }
+
+  // Migrate model versions in agents (skip already-applied migrations)
+  if (rawConfig.agents && typeof rawConfig.agents === "object") {
+    const { migrated, changed, newMigrations } = migrateModelVersions(
+      rawConfig.agents as Record<string, unknown>,
+      existingMigrations
+    )
+    if (changed) {
+      rawConfig.agents = migrated
+      needsWrite = true
+      log("Migrated model versions in agents config")
+    }
+    allNewMigrations.push(...newMigrations)
+  }
+
+  // Migrate model versions in categories (skip already-applied migrations)
+  if (rawConfig.categories && typeof rawConfig.categories === "object") {
+    const { migrated, changed, newMigrations } = migrateModelVersions(
+      rawConfig.categories as Record<string, unknown>,
+      existingMigrations
+    )
+    if (changed) {
+      rawConfig.categories = migrated
+      needsWrite = true
+      log("Migrated model versions in categories config")
+    }
+    allNewMigrations.push(...newMigrations)
+  }
+
+  // Record newly applied migrations
+  if (allNewMigrations.length > 0) {
+    const updatedMigrations = Array.from(existingMigrations)
+    updatedMigrations.push(...allNewMigrations)
+    rawConfig._migrations = updatedMigrations
+    needsWrite = true
+  }
+
+  if (rawConfig.omo_agent) {
+    rawConfig.sisyphus_agent = rawConfig.omo_agent
+    delete rawConfig.omo_agent
+    needsWrite = true
+  }
+
+  if (rawConfig.disabled_agents && Array.isArray(rawConfig.disabled_agents)) {
+    const migrated: string[] = []
+    let changed = false
+    for (const agent of rawConfig.disabled_agents as string[]) {
+      const newAgent = AGENT_NAME_MAP[agent.toLowerCase()] ?? AGENT_NAME_MAP[agent] ?? agent
+      if (newAgent !== agent) {
+        changed = true
+      }
+      migrated.push(newAgent)
+    }
+    if (changed) {
+      rawConfig.disabled_agents = migrated
+      needsWrite = true
+    }
+  }
+
+  if (rawConfig.disabled_hooks && Array.isArray(rawConfig.disabled_hooks)) {
+    const { migrated, changed, removed } = migrateHookNames(rawConfig.disabled_hooks as string[])
+    if (changed) {
+      rawConfig.disabled_hooks = migrated
+      needsWrite = true
+    }
+    if (removed.length > 0) {
+      log(
+        `Removed obsolete hooks from disabled_hooks: ${removed.join(", ")} (these hooks no longer exist in v3.0.0)`
+      )
+    }
+  }
+
+  if (needsWrite) {
+    try {
+      const timestamp = new Date().toISOString().replace(/[:.]/g, "-")
+      const backupPath = `${configPath}.bak.${timestamp}`
+      fs.copyFileSync(configPath, backupPath)
+
+      fs.writeFileSync(configPath, JSON.stringify(rawConfig, null, 2) + "\n", "utf-8")
+      log(`Migrated config file: ${configPath} (backup: ${backupPath})`)
+    } catch (err) {
+      log(`Failed to write migrated config to ${configPath}:`, err)
+    }
+  }
+
+  return needsWrite
+}