feat: add AI autonomous development workflow with OpenCode

- ai-scheduler: daily trigger at 0:00 (UTC+8) to label ready issues
- ai-plan: generate implementation plan when issue gets ai-task label
- ai-implement: code implementation on push to ai/** branches
- ai-iterate: handle PR feedback and scheduled iterations
- Add oh-my-opencode.json config with MiniMax-M2.5 model
- Add prompt files with /ulw-loop command
- Add MINIMAX_API_KEY secret for OpenCode API

Author: ModerRAS

.github/workflows/ai-implement.yml

@@ -66,6 +66,8 @@ jobs:
 
       - name: Run OpenCode
         id: opencode
+        env:
+          MINIMAX_API_KEY: ${{ secrets.MINIMAX_API_KEY }}
         run: |
           npm install -g @opencode-ai/cli
           bunx oh-my-opencode install --no-tui --claude=no --gemini=no --copilot=no
@@ -110,6 +112,8 @@ jobs:
 
       - name: Fix tests
         if: steps.tests.outcome == 'failure'
+        env:
+          MINIMAX_API_KEY: ${{ secrets.MINIMAX_API_KEY }}
         run: |
           npm install -g @opencode-ai/cli
           bunx oh-my-opencode install --no-tui --claude=no --gemini=no --copilot=no

.github/workflows/ai-iterate.yml

@@ -66,6 +66,8 @@ jobs:
       - name: Run OpenCode for changes
         if: steps.comments.outputs.result != '[]'
         id: opencode
+        env:
+          MINIMAX_API_KEY: ${{ secrets.MINIMAX_API_KEY }}
         run: |
           npm install -g @opencode-ai/cli
           bunx oh-my-opencode install --no-tui --claude=no --gemini=no --copilot=no

.github/workflows/ai-plan.yml

@@ -85,6 +85,7 @@ jobs:
         id: opencode
         env:
           ISSUE_DATA: ${{ steps.issue.outputs.result }}
+          MINIMAX_API_KEY: ${{ secrets.MINIMAX_API_KEY }}
         run: |
           npm install -g @opencode-ai/cli
 

.github/workflows/prompts/ai-fix-tests-prompt.txt

@@ -1,3 +1,5 @@
+/ulw-loop
+
 The tests failed for your implementation. Fix the failing tests.
 
 Issue: #{{issue_number}}

.github/workflows/prompts/ai-implement-prompt.txt

@@ -1,4 +1,6 @@
-You are an AI coding assistant. Implement the approved plan for issue #{{issue_number}}: {{issue_title}}
+/ulw-loop
+
+You are an AI coding assistant with oh-my-opencode. Implement the approved plan for issue #{{issue_number}}: {{issue_title}}
 
 Implementation Plan:
 {{plan}}

.github/workflows/prompts/ai-iterate-prompt.txt

@@ -1,3 +1,5 @@
+/ulw-loop
+
 Apply the requested changes described in the PR comments.
 
 Issue: #{{issue_number}}

.github/workflows/prompts/ai-plan-prompt.txt

@@ -1,4 +1,6 @@
-You are an AI coding assistant. Analyze the following GitHub issue and generate a detailed implementation plan.
+/ulw-loop
+
+You are an AI coding assistant with oh-my-opencode. Analyze the following GitHub issue and generate a detailed implementation plan.
 
 Issue #{{issue_number}}: {{issue_title}}