Add MiniMax test-writing composite and template

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

harnesses/composites/test-writing-minimax-repo/v1/harness.yaml

@@ -0,0 +1,11 @@
+kind: composite
+name: test-writing-minimax-repo
+version: 1
+description: "Test writing agent with MiniMax + repo clone via SSH"
+
+layers:
+  - context: test-writing/v1
+  - context: minimax-code-methodology/v1
+  - context: minimax/v1
+  - context: gitea-ssh/v1
+  - context: agent-repo/v1

task-templates/minimax-test-writer.yaml

@@ -0,0 +1,20 @@
+name: minimax-test-writer
+description: "MiniMax test writing agent — comprehensive tests with edge cases"
+model: minimax
+harness: test-writing-minimax-repo/v1
+requires_tags: [claude-code, test-writer, best-practices, git-access, project-repo]
+required_params: [repo_url, agent_repo_url]
+defaults:
+  timeout: 3600
+pre_actions:
+  - type: clone
+    repo: "{{ repo_url }}"
+    branch: main
+    depth: 1
+blocked_combinations:
+  - field: on_success
+    contains_type: commit_pr
+    message: "Use agent_repo instead of commit_pr — avoids F77 SSH alias URL bug"
+warnings:
+  - "MiniMax agents work best with tightly scoped tasks — keep prompts directive and specific"
+  - "MiniMax does NOT support web search or interactive tools — prompts must be self-contained"