feat: add close_on_exit terminal configuration option

Add configurable close_on_exit option to terminal settings that controls
whether the terminal window closes automatically when the Claude process exits.

This allows users to see Claude's spend metrics and final output that are
displayed on process exit, which would otherwise be lost when the terminal
window closes immediately.

- Add close_on_exit property to terminal configuration (default: true)
- Implement early return logic in both snacks and native terminal providers
- Update README documentation with new configuration option
- Maintain backward compatibility with existing behavior

Author: alvarosevilla95

README.md

@@ -157,6 +157,7 @@ For deep technical details, see [ARCHITECTURE.md](./ARCHITECTURE.md).
       split_width_percentage = 0.30,
       provider = "auto", -- "auto", "snacks", or "native"
       auto_close = true,
+      close_on_exit = true, -- Close terminal window when process exits
     },
 
     -- Diff Integration

lua/claudecode/terminal.lua

@@ -24,6 +24,7 @@ local config = {
   show_native_term_exit_tip = true,
   terminal_cmd = nil,
   auto_close = true,
+  close_on_exit = true, -- When true, closes terminal window when process exits
 }
 
 -- Lazy load providers
@@ -102,6 +103,7 @@ local function build_config(opts_override)
     split_side = effective_config.split_side,
     split_width_percentage = effective_config.split_width_percentage,
     auto_close = effective_config.auto_close,
+    close_on_exit = effective_config.close_on_exit,
   }
 end
 
@@ -210,6 +212,8 @@ function M.setup(user_term_config, p_terminal_cmd)
         config[k] = v
       elseif k == "auto_close" and type(v) == "boolean" then
         config[k] = v
+      elseif k == "close_on_exit" and type(v) == "boolean" then
+        config[k] = v
       else
         vim.notify("claudecode.terminal.setup: Invalid value for " .. k .. ": " .. tostring(v), vim.log.levels.WARN)
       end

lua/claudecode/terminal/native.lua

@@ -98,6 +98,10 @@ local function open_terminal(cmd_string, env_table, effective_config, focus)
 
           cleanup_state() -- Clear our managed state first
 
+          if not effective_config.close_on_exit then
+            return
+          end
+
           if current_winid_for_job and vim.api.nvim_win_is_valid(current_winid_for_job) then
             if current_bufnr_for_job and vim.api.nvim_buf_is_valid(current_bufnr_for_job) then
               -- Optional: Check if the window still holds the same terminal buffer

lua/claudecode/terminal/snacks.lua

@@ -29,7 +29,9 @@ local function setup_terminal_events(term_instance, config)
       -- Clean up
       terminal = nil
       vim.schedule(function()
-        term_instance:close({ buf = true })
+        if config.close_on_exit then
+          term_instance:close({ buf = true })
+        end
         vim.cmd.checktime()
       end)
     end, { buf = true })