fix: update OpenCode references to remove 'SST' for consistency across documentation and configuration

docs/user-guide.md

@@ -187,12 +187,12 @@ If you want to do the planning on the web with Claude (Sonnet 4 or Opus), Gemini
 npx bmad-method install
 ```
 
-### OpenCode (SST)
+### OpenCode
 
-BMAD integrates with SST OpenCode via a project-level `opencode.jsonc`/`opencode.json` (JSON-only, no Markdown fallback).
+BMAD integrates with OpenCode via a project-level `opencode.jsonc`/`opencode.json` (JSON-only, no Markdown fallback).
 
 - Installation:
-  - Run `npx bmad-method install` and choose `OpenCode (SST)` in the IDE list.
+  - Run `npx bmad-method install` and choose `OpenCode` in the IDE list.
   - The installer will detect an existing `opencode.jsonc`/`opencode.json` or create a minimal `opencode.jsonc` if missing.
   - It will:
     - Ensure `instructions` includes `.bmad-core/core-config.yaml` (and each selected expansion pack’s `config.yaml`).

tools/installer/bin/bmad.js

@@ -410,7 +410,7 @@ async function promptInstallation() {
           { name: 'Auggie CLI (Augment Code)', value: 'auggie-cli' },
           { name: 'Codex CLI', value: 'codex' },
           { name: 'Codex Web', value: 'codex-web' },
-          { name: 'OpenCode (SST)', value: 'opencode' },
+          { name: 'OpenCode', value: 'opencode' },
         ],
       },
     ]);
@@ -479,9 +479,9 @@ async function promptInstallation() {
     answers.githubCopilotConfig = { configChoice };
   }
 
-  // Configure OpenCode (SST) immediately if selected
+  // Configure OpenCode immediately if selected
   if (ides.includes('opencode')) {
-    console.log(chalk.cyan('\n⚙️  OpenCode (SST) Configuration'));
+    console.log(chalk.cyan('\n⚙️  OpenCode Configuration'));
     console.log(
       chalk.dim(
         'OpenCode will include agents and tasks from the packages you selected above; choose optional key prefixes (defaults: no prefixes).\n',

tools/installer/config/install.config.yaml

@@ -173,11 +173,11 @@ ide-configurations:
       # 4. Re-run this installer to refresh agent sections when the core changes.
 
   opencode:
-    name: SST OpenCode CLI
+    name: OpenCode CLI
     format: jsonc-config
     file: opencode.jsonc
     instructions: |
-      # To use BMAD agents with SST OpenCode CLI:
+      # To use BMAD agents with OpenCode CLI:
       # 1. The installer creates/updates `opencode.jsonc` at your project root.
       # 2. It ensures the BMAD core instructions file is referenced: `./.bmad-core/core-config.yaml`.
       # 3. If an existing `opencode.json` or `opencode.jsonc` is present, it is preserved and only `instructions` are minimally merged.