chore: cleanup agent model references and defaults (#547)

* refactor(agents): remove unused model references

Consistent cleanup of agent model references across all agent files.

🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

* fix(agents): use glm-4.7-free as default librarian model

🤖 Generated with [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

* make playwright skill to be called more

src/agents/document-writer.ts

@@ -16,7 +16,7 @@ export const DOCUMENT_WRITER_PROMPT_METADATA: AgentPromptMetadata = {
 export function createDocumentWriterAgent(
   model: string = DEFAULT_MODEL
 ): AgentConfig {
-  const restrictions = createAgentToolRestrictions(["background_task"])
+  const restrictions = createAgentToolRestrictions([])
 
   return {
     description:

src/agents/explore.ts

@@ -28,7 +28,6 @@ export function createExploreAgent(model: string = DEFAULT_MODEL): AgentConfig {
   const restrictions = createAgentToolRestrictions([
     "write",
     "edit",
-    "background_task",
   ])
 
   return {

src/agents/frontend-ui-ux-engineer.ts

@@ -22,7 +22,7 @@ export const FRONTEND_PROMPT_METADATA: AgentPromptMetadata = {
 export function createFrontendUiUxEngineerAgent(
   model: string = DEFAULT_MODEL
 ): AgentConfig {
-  const restrictions = createAgentToolRestrictions(["background_task"])
+  const restrictions = createAgentToolRestrictions([])
 
   return {
     description:

src/agents/librarian.ts

@@ -2,7 +2,7 @@ import type { AgentConfig } from "@opencode-ai/sdk"
 import type { AgentPromptMetadata } from "./types"
 import { createAgentToolRestrictions } from "../shared/permission-compat"
 
-const DEFAULT_MODEL = "anthropic/claude-sonnet-4-5"
+const DEFAULT_MODEL = "opencode/glm-4.7-free"
 
 export const LIBRARIAN_PROMPT_METADATA: AgentPromptMetadata = {
   category: "exploration",
@@ -25,7 +25,6 @@ export function createLibrarianAgent(model: string = DEFAULT_MODEL): AgentConfig
   const restrictions = createAgentToolRestrictions([
     "write",
     "edit",
-    "background_task",
   ])
 
   return {

src/agents/multimodal-looker.ts

@@ -18,7 +18,6 @@ export function createMultimodalLookerAgent(
     "write",
     "edit",
     "bash",
-    "background_task",
   ])
 
   return {

src/agents/oracle.ts

@@ -102,7 +102,6 @@ export function createOracleAgent(model: string = DEFAULT_MODEL): AgentConfig {
     "write",
     "edit",
     "task",
-    "background_task",
   ])
 
   const base = {

src/features/builtin-skills/skills.ts

@@ -2,7 +2,7 @@ import type { BuiltinSkill } from "./types"
 
 const playwrightSkill: BuiltinSkill = {
   name: "playwright",
-  description: "Browser automation with Playwright MCP. Use for web scraping, testing, screenshots, and browser interactions.",
+  description: "MUST USE for any browser-related tasks. Browser automation via Playwright MCP - verification, browsing, information gathering, web scraping, testing, screenshots, and all browser interactions.",
   template: `# Playwright Browser Automation
 
 This skill provides browser automation capabilities via the Playwright MCP server.`,