feat(codeagent-wrapper): default to skip-permissions and bypass-sandbox

- Claude: enable --dangerously-skip-permissions by default (set CODEAGENT_SKIP_PERMISSIONS=false to disable)
- Codex: enable --dangerously-bypass-approvals-and-sandbox by default (set CODEX_BYPASS_SANDBOX=false to disable)
- Gemini: use positional argument instead of deprecated -p flag (except for stdin mode)
- Add envFlagDefaultTrue helper for default-true env flags

Generated with SWE-Agent.ai

Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>

codeagent-wrapper/config.go

@@ -112,6 +112,15 @@ func parseBoolFlag(val string, defaultValue bool) bool {
 	}
 }
 
+// envFlagDefaultTrue returns true unless the env var is explicitly set to false/0/no/off.
+func envFlagDefaultTrue(key string) bool {
+	val, ok := os.LookupEnv(key)
+	if !ok {
+		return true
+	}
+	return parseBoolFlag(val, true)
+}
+
 func validateAgentName(name string) error {
 	if strings.TrimSpace(name) == "" {
 		return fmt.Errorf("agent name is empty")