feat(agent): log full command line at debug level when spawning agents

Add a debug-level log line in every agent backend (claude, codex,
opencode, openclaw, gemini, hermes) that prints the executable path
and full argument list when spawning the agent process. Helps diagnose
custom args, model overrides, and other CLI flag issues.

server/pkg/agent/claude.go

@@ -37,6 +37,7 @@ func (b *claudeBackend) Execute(ctx context.Context, prompt string, opts ExecOpt
 	args := buildClaudeArgs(opts, b.cfg.Logger)
 
 	cmd := exec.CommandContext(runCtx, execPath, args...)
+	b.cfg.Logger.Debug("agent command", "exec", execPath, "args", args)
 	cmd.WaitDelay = 10 * time.Second
 	if opts.Cwd != "" {
 		cmd.Dir = opts.Cwd

server/pkg/agent/codex.go

@@ -42,6 +42,7 @@ func (b *codexBackend) Execute(ctx context.Context, prompt string, opts ExecOpti
 
 	codexArgs := append([]string{"app-server", "--listen", "stdio://"}, filterCustomArgs(opts.CustomArgs, codexBlockedArgs, b.cfg.Logger)...)
 	cmd := exec.CommandContext(runCtx, execPath, codexArgs...)
+	b.cfg.Logger.Debug("agent command", "exec", execPath, "args", codexArgs)
 	if opts.Cwd != "" {
 		cmd.Dir = opts.Cwd
 	}

server/pkg/agent/gemini.go

@@ -35,6 +35,7 @@ func (b *geminiBackend) Execute(ctx context.Context, prompt string, opts ExecOpt
 	args := buildGeminiArgs(prompt, opts, b.cfg.Logger)
 
 	cmd := exec.CommandContext(runCtx, execPath, args...)
+	b.cfg.Logger.Debug("agent command", "exec", execPath, "args", args)
 	cmd.WaitDelay = 10 * time.Second
 	if opts.Cwd != "" {
 		cmd.Dir = opts.Cwd

server/pkg/agent/hermes.go

@@ -36,6 +36,7 @@ func (b *hermesBackend) Execute(ctx context.Context, prompt string, opts ExecOpt
 
 	hermesArgs := append([]string{"acp"}, opts.CustomArgs...)
 	cmd := exec.CommandContext(runCtx, execPath, hermesArgs...)
+	b.cfg.Logger.Debug("agent command", "exec", execPath, "args", hermesArgs)
 	if opts.Cwd != "" {
 		cmd.Dir = opts.Cwd
 	}

server/pkg/agent/openclaw.go

@@ -60,6 +60,7 @@ func (b *openclawBackend) Execute(ctx context.Context, prompt string, opts ExecO
 	args = append(args, "--message", prompt)
 
 	cmd := exec.CommandContext(runCtx, execPath, args...)
+	b.cfg.Logger.Debug("agent command", "exec", execPath, "args", args)
 	cmd.WaitDelay = 10 * time.Second
 	if opts.Cwd != "" {
 		cmd.Dir = opts.Cwd

server/pkg/agent/opencode.go

@@ -55,6 +55,7 @@ func (b *opencodeBackend) Execute(ctx context.Context, prompt string, opts ExecO
 	args = append(args, prompt)
 
 	cmd := exec.CommandContext(runCtx, execPath, args...)
+	b.cfg.Logger.Debug("agent command", "exec", execPath, "args", args)
 	cmd.WaitDelay = 10 * time.Second
 	if opts.Cwd != "" {
 		cmd.Dir = opts.Cwd