feat(claude): limit concurrent subagents and spawn depth

Set CLAUDE_CODE_MAX_CONCURRENT_SUBAGENTS=5 and
CLAUDE_CODE_MAX_SUBAGENT_SPAWN_DEPTH=1 so Claude matches the Codex agent
limits and subagents cannot start further subagents.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

adapters/claude/config/settings.json

@@ -6,7 +6,9 @@
   },
   "sandbox": __CLAUDE_SANDBOX__,
   "env": {
-    "CLAUDE_CODE_MAX_TOOL_USE_CONCURRENCY": "__CLAUDE_CODE_MAX_TOOL_USE_CONCURRENCY__"
+    "CLAUDE_CODE_MAX_TOOL_USE_CONCURRENCY": "__CLAUDE_CODE_MAX_TOOL_USE_CONCURRENCY__",
+    "CLAUDE_CODE_MAX_CONCURRENT_SUBAGENTS": "5",
+    "CLAUDE_CODE_MAX_SUBAGENT_SPAWN_DEPTH": "1"
   },
   "statusLine": {
     "type": "command",

scripts/tests/test-shell-packages.ps1

@@ -62,6 +62,8 @@ foreach ($shell in @('powershell','bash')) {
             throw "Claude finish hook is incorrect in $package"
         } elseif ($content -notmatch '"defaultMode"\s*:\s*"auto"') {
             throw "Claude auto permission mode is missing in $package"
+        } elseif ($settings.env.CLAUDE_CODE_MAX_CONCURRENT_SUBAGENTS -ne '5' -or $settings.env.CLAUDE_CODE_MAX_SUBAGENT_SPAWN_DEPTH -ne '1') {
+            throw "Claude subagent limits are missing in $package"
         } elseif ($sandboxSupported -and ($settings.sandbox.enabled -ne $true -or $settings.sandbox.allowUnsandboxedCommands -ne $false -or $settings.sandbox.failIfUnavailable -ne $true -or (@($settings.sandbox.network.allowedDomains) -join ',') -ne 'mcp.context7.com' -or @($settings.sandbox.PSObject.Properties).Count -ne 4)) {
             throw "Claude strict sandbox is missing in $package"
         } elseif (-not $sandboxSupported -and ($settings.sandbox.enabled -ne $false -or @($settings.sandbox.PSObject.Properties).Count -ne 1)) {

scripts/tests/test-shell-packages.sh

@@ -80,6 +80,8 @@ for shell in powershell bash; do
       ! grep -q 'flashbang-if-input' "$package/$file"
       ! grep -q '"async"[[:space:]]*:[[:space:]]*true' "$package/$file"
       grep -q '"defaultMode"[[:space:]]*:[[:space:]]*"auto"' "$package/$file"
+      grep -q '"CLAUDE_CODE_MAX_CONCURRENT_SUBAGENTS"[[:space:]]*:[[:space:]]*"5"' "$package/$file"
+      grep -q '"CLAUDE_CODE_MAX_SUBAGENT_SPAWN_DEPTH"[[:space:]]*:[[:space:]]*"1"' "$package/$file"
       python3 -c 'import json,sys; settings=json.load(open(sys.argv[1], encoding="utf-8-sig")); expected={"enabled": True, "allowUnsandboxedCommands": False, "failIfUnavailable": True, "network": {"allowedDomains": ["mcp.context7.com"]}} if sys.argv[2] == "true" else {"enabled": False}; assert settings["sandbox"] == expected' "$package/$file" "$sandbox_supported"
       statusline_extension='sh'
       [ "$shell" != powershell ] || statusline_extension=ps1