Add Opencode IDE installer (#820)

- Added docs/ide-info/opencode.md
- Added tool/cli/installers/lib/ide/opencode.js
- Modified tools/installers/lib/ide/core/detector.js to include
detection for opencode command dir
- Modified tools/cli/platform-codes.yaml to include opencode config
- Modified tools/cli/installers/lib/ide/workflow-command-template.md to
include frontmatter with description as opencode requires this for
commands and adding it to the template by default does not seem to
impact other IDEs
- Modified src/modules/bmm/workflows/workflow-status/workflow.yaml
description so that it properly escapes quotes when interpolated in the
teplate

tools/platform-codes.yaml

@@ -37,6 +37,12 @@ platforms:
     category: ide
     description: "AI coding assistant"
 
+  opencode:
+    name: "OpenCode"
+    preferred: false
+    category: ide
+    description: "OpenCode terminal coding assistant"
+
   auggie:
     name: "Auggie"
     preferred: false