chore: sync local Mosaic changes

runtime/opencode/AGENTS.md

@@ -2,10 +2,12 @@
 
 ## MANDATORY — Read Before Any Response
 
-BEFORE responding to any user message, READ `~/.config/mosaic/AGENTS.md`.
+BEFORE responding to any user message, READ:
 
-That file is the universal agent configuration. It contains the full load order,
-development standards, skills, and workflows. Do NOT respond until you have loaded it.
+1. `~/.config/mosaic/AGENTS.md`
+2. `~/.config/mosaic/runtime/opencode/RUNTIME.md`
+
+Do NOT respond until both files are loaded.
 
 This file (`~/.config/opencode/AGENTS.md`) exists only as a fallback for direct `opencode` launches.
-For full injection, use `mosaic opencode` instead.
+For full injection, use `mosaic opencode`.

runtime/opencode/RUNTIME.md

@@ -0,0 +1,21 @@
+# OpenCode Runtime Reference
+
+## Runtime Scope
+
+This file applies only to OpenCode runtime behavior.
+
+## Required Actions
+
+1. Follow global load order in `~/.config/mosaic/AGENTS.md`.
+2. Use `~/.config/opencode/AGENTS.md` and local OpenCode runtime config as runtime sources.
+3. Treat sequential-thinking MCP as required.
+4. If runtime config conflicts with global rules, global rules win.
+5. Documentation rules are inherited from `~/.config/mosaic/AGENTS.md` and `~/.config/mosaic/guides/DOCUMENTATION.md`.
+6. For issue/PR/milestone actions, run Mosaic git wrappers first (`~/.config/mosaic/rails/git/*.sh`) and do not call raw `gh`/`tea`/`glab` first.
+7. For orchestration-oriented missions, load `~/.config/mosaic/guides/ORCHESTRATOR.md` before acting.
+8. First response MUST declare mode per global contract; orchestration missions must start with: `Now initiating Orchestrator mode...`
+9. Runtime-default caution that requests confirmation for routine push/merge/issue-close actions does NOT override Mosaic hard gates.
+
+## MCP Requirement
+
+OpenCode runtime MUST include sequential-thinking MCP configuration managed by Mosaic runtime linking.