Update agent definitions: remove worktree isolation, upgrade models

- Remove isolation: worktree from write-capable agents (documenter,
  implementer, migrator, refactorer, test-writer) — run in main worktree
- Upgrade investigator and security-auditor from sonnet to opus

Author: claude

container/.devcontainer/plugins/devs-marketplace/plugins/agent-system/agents/documenter.md

@@ -15,7 +15,6 @@ tools: Read, Write, Edit, Glob, Grep
 model: opus
 color: magenta
 permissionMode: acceptEdits
-isolation: worktree
 memory:
   scope: project
 skills:

container/.devcontainer/plugins/devs-marketplace/plugins/agent-system/agents/implementer.md

@@ -11,7 +11,6 @@ tools: Read, Write, Edit, Glob, Grep, Bash
 model: opus
 color: blue
 permissionMode: acceptEdits
-isolation: worktree
 memory:
   scope: project
 skills:

container/.devcontainer/plugins/devs-marketplace/plugins/agent-system/agents/investigator.md

@@ -15,7 +15,7 @@ description: >-
   any files. Do not use for code modifications, file writing, or
   implementation tasks.
 tools: Read, Glob, Grep, WebSearch, WebFetch, Bash
-model: sonnet
+model: opus
 color: cyan
 permissionMode: plan
 memory:

container/.devcontainer/plugins/devs-marketplace/plugins/agent-system/agents/migrator.md

@@ -14,7 +14,6 @@ tools: Read, Edit, Write, Glob, Grep, Bash, WebFetch
 model: opus
 color: magenta
 permissionMode: acceptEdits
-isolation: worktree
 memory:
   scope: user
 skills:

container/.devcontainer/plugins/devs-marketplace/plugins/agent-system/agents/refactorer.md

@@ -14,7 +14,6 @@ tools: Read, Edit, Glob, Grep, Bash
 model: opus
 color: yellow
 permissionMode: acceptEdits
-isolation: worktree
 memory:
   scope: project
 skills:

container/.devcontainer/plugins/devs-marketplace/plugins/agent-system/agents/security-auditor.md

@@ -16,7 +16,7 @@ description: >-
   modifying any files. Do not use for fixing vulnerabilities or
   implementing security changes — audit and reporting only.
 tools: Read, Glob, Grep, Bash
-model: sonnet
+model: opus
 color: red
 permissionMode: plan
 background: true

container/.devcontainer/plugins/devs-marketplace/plugins/agent-system/agents/test-writer.md

@@ -14,7 +14,6 @@ tools: Read, Write, Edit, Glob, Grep, Bash
 model: opus
 color: green
 permissionMode: acceptEdits
-isolation: worktree
 memory:
   scope: project
 skills: