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

docs/ide-info/opencode.md

@@ -0,0 +1,24 @@
+# BMAD Method - OpenCode Instructions
+
+## Activating Agents
+
+BMAD agents are installed as OpenCode agents in `.opencode/agent/BMAD/{module_name}` and workflow commands in `.opencode/command/BMAD/{module_name}`.
+
+### How to Use
+
+1. **Switch Agents**: Press **Tab** to cycle through primary agents or select using the `/agents`
+2. **Activate Agent**: Once the Agent is selected say `hello` or any prompt to activate that agent persona
+3. **Execute Commands**: Type `/bmad` to see and execute bmad workflow commands (commands allow for fuzzy matching)
+
+### Examples
+
+```
+/agents - to see a list of agents and switch between them
+/bmad/bmm/workflows/workflow-init - Activate the workflow-init command
+```
+
+### Notes
+
+- Press **Tab** to switch between primary agents (Analyst, Architect, Dev, etc.)
+- Commands are autocompleted when you type `/` and allow for fuzzy matching
+- Workflow commands execute in current agent context, make sure you have the right agent activated before running a command