feat: updated default agent from minimax-m2.5-free to gpt-5-mini

.config/opencode/agent/subagents/build.md

@@ -1,7 +1,7 @@
 ---
 description: "Build and validation agent"
 mode: subagent
-model: opencode/minimax-m2.5-free
+model: github-copilot/gpt-5-mini
 temperature: 0.1
 permission:
   bash:

.config/opencode/agent/subagents/coder.md

@@ -1,7 +1,7 @@
 ---
 description: "Executes coding subtasks in sequence, ensuring completion as specified"
 mode: subagent
-model: opencode/minimax-m2.5-free
+model: github-copilot/gpt-5-mini
 temperature: 0.1
 permission:
   bash: deny

.config/opencode/agent/subagents/context.md

@@ -1,7 +1,7 @@
 ---
 description: "Language-agnostic codebase pattern analyst agent"
 mode: subagent
-model: opencode/minimax-m2.5-free
+model: github-copilot/gpt-5-mini
 temperature: 0.1
 permission:
   bash: deny

.config/opencode/agent/subagents/documentation.md

@@ -1,7 +1,7 @@
 ---
 description: "Universal code documentation subagent: inserts/updates doc comments for functions, methods, and modules in any language."
 mode: subagent
-model: opencode/minimax-m2.5-free
+model: github-copilot/gpt-5-mini
 temperature: 0.2
 permission:
   bash: deny

.config/opencode/agent/subagents/research.md

@@ -1,7 +1,7 @@
 ---
 description: "Research subagent for information gathering and summarization"
 mode: subagent
-model: opencode/minimax-m2.5-free
+model: github-copilot/gpt-5-mini
 temperature: 0.1
 permission:
   bash:

.config/opencode/agent/subagents/reviewer.md

@@ -1,7 +1,7 @@
 ---
 description: "Comprehensive code review, security, and quality assurance subagent"
 mode: subagent
-model: opencode/minimax-m2.5-free
+model: github-copilot/gpt-5-mini
 temperature: 0.1
 permission:
   bash: deny

.config/opencode/agent/subagents/task-manager.md

@@ -1,7 +1,7 @@
 ---
 description: "Breaks down complex features into small, verifiable subtasks"
 mode: subagent
-model: opencode/minimax-m2.5-free
+model: github-copilot/gpt-5-mini
 temperature: 0.1
 permission:
   bash: deny

.config/opencode/agent/subagents/tester.md

@@ -1,7 +1,7 @@
 ---
 description: "Test authoring and TDD agent"
 mode: subagent
-model: opencode/minimax-m2.5-free
+model: github-copilot/gpt-5-mini
 temperature: 0.1
 permission:
   bash:

.config/opencode/opencode.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://opencode.ai/config.json",
   "theme": "tokyonight",
-  "model": "opencode/minimax-m2.5-free",
+  "model": "github-copilot/gpt-5-mini",
   "lsp": {
     "clangd": {
       "disabled": true