core: modularize config parsing to improve maintainability

Extract error handling, parsing logic, and variable substitution into dedicated
modules. This reduces duplication between tui.json and opencode.json parsing
and makes the config system easier to extend for future config formats.

packages/opencode/test/config/config.test.ts

@@ -2,6 +2,7 @@ import { test, expect, describe, mock, afterEach, beforeEach } from "bun:test"
 import { Effect, Layer, Option } from "effect"
 import { NodeFileSystem, NodePath } from "@effect/platform-node"
 import { Config, ConfigManaged } from "../../src/config"
+import { ConfigParse } from "../../src/config/parse"
 import { EffectFlock } from "@opencode-ai/shared/util/effect-flock"
 
 import { Instance } from "../../src/project/instance"
@@ -2211,17 +2212,20 @@ describe("OPENCODE_CONFIG_CONTENT token substitution", () => {
 // parseManagedPlist unit tests — pure function, no OS interaction
 
 test("parseManagedPlist strips MDM metadata keys", async () => {
-  const config = await ConfigManaged.parseManagedPlist(
-    JSON.stringify({
-      PayloadDisplayName: "OpenCode Managed",
-      PayloadIdentifier: "ai.opencode.managed.test",
-      PayloadType: "ai.opencode.managed",
-      PayloadUUID: "AAAA-BBBB-CCCC",
-      PayloadVersion: 1,
-      _manualProfile: true,
-      share: "disabled",
-      model: "mdm/model",
-    }),
+  const config = ConfigParse.parse(
+    Config.Info,
+    await ConfigManaged.parseManagedPlist(
+      JSON.stringify({
+        PayloadDisplayName: "OpenCode Managed",
+        PayloadIdentifier: "ai.opencode.managed.test",
+        PayloadType: "ai.opencode.managed",
+        PayloadUUID: "AAAA-BBBB-CCCC",
+        PayloadVersion: 1,
+        _manualProfile: true,
+        share: "disabled",
+        model: "mdm/model",
+      }),
+    ),
     "test:mobileconfig",
   )
   expect(config.share).toBe("disabled")
@@ -2233,12 +2237,15 @@ test("parseManagedPlist strips MDM metadata keys", async () => {
 })
 
 test("parseManagedPlist parses server settings", async () => {
-  const config = await ConfigManaged.parseManagedPlist(
-    JSON.stringify({
-      $schema: "https://opencode.ai/config.json",
-      server: { hostname: "127.0.0.1", mdns: false },
-      autoupdate: true,
-    }),
+  const config = ConfigParse.parse(
+    Config.Info,
+    await ConfigManaged.parseManagedPlist(
+      JSON.stringify({
+        $schema: "https://opencode.ai/config.json",
+        server: { hostname: "127.0.0.1", mdns: false },
+        autoupdate: true,
+      }),
+    ),
     "test:mobileconfig",
   )
   expect(config.server?.hostname).toBe("127.0.0.1")
@@ -2247,18 +2254,21 @@ test("parseManagedPlist parses server settings", async () => {
 })
 
 test("parseManagedPlist parses permission rules", async () => {
-  const config = await ConfigManaged.parseManagedPlist(
-    JSON.stringify({
-      $schema: "https://opencode.ai/config.json",
-      permission: {
-        "*": "ask",
-        bash: { "*": "ask", "rm -rf *": "deny", "curl *": "deny" },
-        grep: "allow",
-        glob: "allow",
-        webfetch: "ask",
-        "~/.ssh/*": "deny",
-      },
-    }),
+  const config = ConfigParse.parse(
+    Config.Info,
+    await ConfigManaged.parseManagedPlist(
+      JSON.stringify({
+        $schema: "https://opencode.ai/config.json",
+        permission: {
+          "*": "ask",
+          bash: { "*": "ask", "rm -rf *": "deny", "curl *": "deny" },
+          grep: "allow",
+          glob: "allow",
+          webfetch: "ask",
+          "~/.ssh/*": "deny",
+        },
+      }),
+    ),
     "test:mobileconfig",
   )
   expect(config.permission?.["*"]).toBe("ask")
@@ -2271,19 +2281,23 @@ test("parseManagedPlist parses permission rules", async () => {
 })
 
 test("parseManagedPlist parses enabled_providers", async () => {
-  const config = await ConfigManaged.parseManagedPlist(
-    JSON.stringify({
-      $schema: "https://opencode.ai/config.json",
-      enabled_providers: ["anthropic", "google"],
-    }),
+  const config = ConfigParse.parse(
+    Config.Info,
+    await ConfigManaged.parseManagedPlist(
+      JSON.stringify({
+        $schema: "https://opencode.ai/config.json",
+        enabled_providers: ["anthropic", "google"],
+      }),
+    ),
     "test:mobileconfig",
   )
   expect(config.enabled_providers).toEqual(["anthropic", "google"])
 })
 
 test("parseManagedPlist handles empty config", async () => {
-  const config = await ConfigManaged.parseManagedPlist(
-    JSON.stringify({ $schema: "https://opencode.ai/config.json" }),
+  const config = ConfigParse.parse(
+    Config.Info,
+    await ConfigManaged.parseManagedPlist(JSON.stringify({ $schema: "https://opencode.ai/config.json" })),
     "test:mobileconfig",
   )
   expect(config.$schema).toBe("https://opencode.ai/config.json")