refactor: wave 2 - split atlas, auto-update-checker, session-recovery, todo-enforcer, background-task hooks

- Extract atlas/ into 15 focused modules (hook, event handler, tool policies, types, etc.)
- Split auto-update-checker into checker/ and hook/ subdirectories with single-purpose files
- Decompose session-recovery into separate recovery strategy files per error type
- Extract todo-continuation-enforcer from monolith to directory with dedicated modules
- Split background-task/tools.ts into individual tool creator files
- Extract command-executor, tmux-utils into focused sub-modules
- Split config/schema.ts into domain-specific schema files
- Decompose cli/config-manager.ts into focused modules
- Rollback skill-mcp-manager, model-availability, index.ts splits that broke tests
- Fix all import path depths for moved files (../../ -> ../../../)
- Add explicit type annotations to resolve TS7006 implicit any errors

Typecheck: 0 errors
Tests: 2359 pass, 5 fail (all pre-existing)

src/hooks/auto-update-checker/checker/config-paths.ts

@@ -0,0 +1,37 @@
+import * as os from "node:os"
+import * as path from "node:path"
+import {
+  USER_CONFIG_DIR,
+  USER_OPENCODE_CONFIG,
+  USER_OPENCODE_CONFIG_JSONC,
+  getWindowsAppdataDir,
+} from "../constants"
+
+export function getConfigPaths(directory: string): string[] {
+  const paths = [
+    path.join(directory, ".opencode", "opencode.json"),
+    path.join(directory, ".opencode", "opencode.jsonc"),
+    USER_OPENCODE_CONFIG,
+    USER_OPENCODE_CONFIG_JSONC,
+  ]
+
+  if (process.platform === "win32") {
+    const crossPlatformDir = path.join(os.homedir(), ".config")
+    const appdataDir = getWindowsAppdataDir()
+
+    if (appdataDir) {
+      const alternateDir = USER_CONFIG_DIR === crossPlatformDir ? appdataDir : crossPlatformDir
+      const alternateConfig = path.join(alternateDir, "opencode", "opencode.json")
+      const alternateConfigJsonc = path.join(alternateDir, "opencode", "opencode.jsonc")
+
+      if (!paths.includes(alternateConfig)) {
+        paths.push(alternateConfig)
+      }
+      if (!paths.includes(alternateConfigJsonc)) {
+        paths.push(alternateConfigJsonc)
+      }
+    }
+  }
+
+  return paths
+}