fix: properly hide deprecated tier-specific agents from primary access

- Add proper frontmatter to all emptied tier-specific agents
- Mark them as hidden subagents with deprecation notice
- Ensures they cannot be accessed as primary agents
- Completes the tier selector architecture migration

All deprecated agents now have:
  mode: subagent
  hidden: true
  description: "This subagent should only be called manually by the user."

This prevents accidental usage of the deprecated agents while maintaining
the clean tier selector architecture where only 6 primary agents are
accessible to users.

.opencode/agents/behave-tester-codex.md

@@ -0,0 +1,7 @@
+---
+description: This subagent should only be called manually by the user.
+mode: subagent
+hidden: true
+---
+
+This agent has been deprecated. Use the tier selector architecture instead.

.opencode/agents/behave-tester-haiku.md

@@ -0,0 +1,7 @@
+---
+description: This subagent should only be called manually by the user.
+mode: subagent
+hidden: true
+---
+
+This agent has been deprecated. Use the tier selector architecture instead.

.opencode/agents/behave-tester-opus.md

@@ -0,0 +1,7 @@
+---
+description: This subagent should only be called manually by the user.
+mode: subagent
+hidden: true
+---
+
+This agent has been deprecated. Use the tier selector architecture instead.

.opencode/agents/behave-tester-sonnet.md

@@ -0,0 +1,7 @@
+---
+description: This subagent should only be called manually by the user.
+mode: subagent
+hidden: true
+---
+
+This agent has been deprecated. Use the tier selector architecture instead.

.opencode/agents/build-opencode.md

@@ -31,7 +31,7 @@ You have FULL authority to:
 
 ## Agent Format Documentation
 
-The official OpenCode agent format is documented at https://opencode.ai/docs/agents
+The official OpenCode agent format is documented at https://opencode.ai/docs/agents , read this website and related links in completely to ensure you understand how the files in the `.opencode/` directory work and are formated.
 
 Key requirements for agent files:
 1. **Markdown files** with `.md` extension

.opencode/agents/coverage-checker.md

@@ -0,0 +1,7 @@
+---
+description: This subagent should only be called manually by the user.
+mode: subagent
+hidden: true
+---
+
+This agent has been deprecated. Use the tier selector architecture instead.

.opencode/agents/implementer-codex.md

@@ -0,0 +1,7 @@
+---
+description: This subagent should only be called manually by the user.
+mode: subagent
+hidden: true
+---
+
+This agent has been deprecated. Use the tier selector architecture instead.

.opencode/agents/implementer-haiku.md

@@ -0,0 +1,7 @@
+---
+description: This subagent should only be called manually by the user.
+mode: subagent
+hidden: true
+---
+
+This agent has been deprecated. Use the tier selector architecture instead.

.opencode/agents/implementer-opus.md

@@ -0,0 +1,7 @@
+---
+description: This subagent should only be called manually by the user.
+mode: subagent
+hidden: true
+---
+
+This agent has been deprecated. Use the tier selector architecture instead.

.opencode/agents/implementer-sonnet.md

@@ -0,0 +1,7 @@
+---
+description: This subagent should only be called manually by the user.
+mode: subagent
+hidden: true
+---
+
+This agent has been deprecated. Use the tier selector architecture instead.

.opencode/agents/quality-gate-escalator.md

@@ -0,0 +1,7 @@
+---
+description: This subagent should only be called manually by the user.
+mode: subagent
+hidden: true
+---
+
+This agent has been deprecated. Use the tier selector architecture instead.

.opencode/agents/robot-tester-codex.md

@@ -0,0 +1,7 @@
+---
+description: This subagent should only be called manually by the user.
+mode: subagent
+hidden: true
+---
+
+This agent has been deprecated. Use the tier selector architecture instead.

.opencode/agents/robot-tester-haiku.md

@@ -0,0 +1,7 @@
+---
+description: This subagent should only be called manually by the user.
+mode: subagent
+hidden: true
+---
+
+This agent has been deprecated. Use the tier selector architecture instead.

.opencode/agents/robot-tester-opus.md

@@ -0,0 +1,7 @@
+---
+description: This subagent should only be called manually by the user.
+mode: subagent
+hidden: true
+---
+
+This agent has been deprecated. Use the tier selector architecture instead.

.opencode/agents/robot-tester-sonnet.md

@@ -0,0 +1,7 @@
+---
+description: This subagent should only be called manually by the user.
+mode: subagent
+hidden: true
+---
+
+This agent has been deprecated. Use the tier selector architecture instead.

.opencode/agents/subtask-loop-v2.md

@@ -0,0 +1,7 @@
+---
+description: This subagent should only be called manually by the user.
+mode: subagent
+hidden: true
+---
+
+This agent has been deprecated. Use the tier selector architecture instead.