chore: update subagent default models (#1120)

Co-authored-by: Letta <noreply@letta.com>

src/agent/subagents/builtin/general-purpose.md

@@ -2,7 +2,7 @@
 name: general-purpose
 description: Full-capability agent for research, planning, and implementation
 tools: Bash, TaskOutput, Edit, Glob, Grep, KillBash, LS, MultiEdit, Read, TodoWrite, Write
-model: sonnet-4.5
+model: sonnet
 memoryBlocks: all
 mode: stateful
 ---

src/agent/subagents/builtin/history-analyzer.md

@@ -3,7 +3,7 @@ name: history-analyzer
 description: Analyze Claude Code or Codex conversation history and directly update agent memory files with insights
 tools: Read, Write, Bash, Glob, Grep
 skills: migrating-from-codex-and-claude-code
-model: sonnet
+model: glm-5
 memoryBlocks: none
 mode: stateless
 permissionMode: bypassPermissions

src/agent/subagents/builtin/memory.md

@@ -2,7 +2,7 @@
 name: memory
 description: Decompose and reorganize memory files into focused, single-purpose files using `/` naming
 tools: Read, Edit, Write, Glob, Grep, Bash
-model: opus
+model: sonnet
 memoryBlocks: none
 permissionMode: bypassPermissions
 ---

src/agent/subagents/builtin/recall.md

@@ -2,7 +2,7 @@
 name: recall
 description: Search conversation history to recall past discussions, decisions, and context
 tools: Bash, Read, TaskOutput
-model: opus
+model: haiku
 memoryBlocks: none
 mode: stateless
 ---

src/agent/subagents/builtin/reflection.md

@@ -2,7 +2,7 @@
 name: reflection
 description: Background agent that reflects on recent conversations and updates memory files
 tools: Read, Edit, Write, Glob, Grep, Bash, TaskOutput
-model: sonnet-4.5
+model: glm-5
 memoryBlocks: none
 skills: searching-messages
 mode: stateless