refactor: consolidate OpenCode templates and add support for tasks, tools, and workflows (#1556)

- Move opencode/body.md to combined/opencode-agent.md with frontmatter
- Add combined templates for tasks, tools, and workflows (both .md and .yaml)
- Replace hardcoded _bmad path with {{bmadFolderName}} variable
- Remove split/opencode/ templates (header.md, body.md)
- Add .gitkeep to preserve empty split/ directory

tools/cli/installers/lib/ide/templates/combined/opencode-agent.md

@@ -1,7 +1,12 @@
+---
+mode: primary
+description: '{{description}}'
+---
+
 You must fully embody this agent's persona and follow all activation instructions exactly as specified. NEVER break character until given an exit command.
 
 <agent-activation CRITICAL="TRUE">
-1. LOAD the FULL agent file from {project-root}/_bmad/{{path}}
+1. LOAD the FULL agent file from {project-root}/{{bmadFolderName}}/{{path}}
 2. READ its entire contents - this contains the complete agent persona, menu, and instructions
 3. FOLLOW every step in the <activation> section precisely
 4. DISPLAY the welcome/greeting as instructed

tools/cli/installers/lib/ide/templates/combined/opencode-task.md

@@ -0,0 +1,12 @@
+---
+description: '{{description}}'
+---
+
+Execute the BMAD '{{name}}' task.
+
+TASK INSTRUCTIONS:
+1. LOAD the task file from {project-root}/{{bmadFolderName}}/{{path}}
+2. READ its entire contents
+3. FOLLOW every instruction precisely as specified
+
+TASK FILE: {project-root}/{{bmadFolderName}}/{{path}}

tools/cli/installers/lib/ide/templates/combined/opencode-tool.md

@@ -0,0 +1,12 @@
+---
+description: '{{description}}'
+---
+
+Execute the BMAD '{{name}}' tool.
+
+TOOL INSTRUCTIONS:
+1. LOAD the tool file from {project-root}/{{bmadFolderName}}/{{path}}
+2. READ its entire contents
+3. FOLLOW every instruction precisely as specified
+
+TOOL FILE: {project-root}/{{bmadFolderName}}/{{path}}

tools/cli/installers/lib/ide/templates/combined/opencode-workflow-yaml.md

@@ -0,0 +1,15 @@
+---
+description: '{{description}}'
+---
+
+Execute the BMAD '{{name}}' workflow.
+
+CRITICAL: You must load and follow the workflow definition exactly.
+
+WORKFLOW INSTRUCTIONS:
+1. LOAD the workflow file from {project-root}/{{bmadFolderName}}/{{path}}
+2. READ its entire contents
+3. FOLLOW every step precisely as specified
+4. DO NOT skip or modify any steps
+
+WORKFLOW FILE: {project-root}/{{bmadFolderName}}/{{path}}

tools/cli/installers/lib/ide/templates/combined/opencode-workflow.md

@@ -0,0 +1,15 @@
+---
+description: '{{description}}'
+---
+
+Execute the BMAD '{{name}}' workflow.
+
+CRITICAL: You must load and follow the workflow definition exactly.
+
+WORKFLOW INSTRUCTIONS:
+1. LOAD the workflow file from {project-root}/{{bmadFolderName}}/{{path}}
+2. READ its entire contents
+3. FOLLOW every step precisely as specified
+4. DO NOT skip or modify any steps
+
+WORKFLOW FILE: {project-root}/{{bmadFolderName}}/{{path}}

tools/cli/installers/lib/ide/templates/split/opencode/header.md

@@ -1,4 +0,0 @@
----
-name: '{{name}}'
-description: '{{description}}'
----