Add worktree.defaultPath config

The redesigned worktree-creation flow never asks the user to type a path
from scratch; instead it offers candidate parent directories. Until a repo
has any linked worktrees to learn from, there's nothing to offer, so let
users seed that list with a configured default location.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs-master/Config.md

@@ -527,6 +527,14 @@ git:
   # to 40 to disable truncation.
   truncateCopiedCommitHashesTo: 12
 
+# Config relating to git worktrees
+worktree:
+  # Default parent directory for new worktrees. It is offered as a candidate
+  # location alongside the parent directories of any worktrees you already have.
+  # A relative path is resolved against the repository's root directory, so
+  # "../worktrees" sits beside the repo and ".worktrees" sits inside it.
+  defaultPath: ""
+
 # Periodic update checks
 update:
   # One of: 'prompt' (default) | 'background' | 'never'

pkg/config/user_config.go

@@ -11,6 +11,8 @@ type UserConfig struct {
 	Gui GuiConfig `yaml:"gui"`
 	// Config relating to git
 	Git GitConfig `yaml:"git"`
+	// Config relating to git worktrees
+	Worktree WorktreeConfig `yaml:"worktree"`
 	// Periodic update checks
 	Update UpdateConfig `yaml:"update"`
 	// Background refreshes
@@ -422,6 +424,12 @@ type CommitPrefixConfig struct {
 	Replace string `yaml:"replace" jsonschema:"example=[$1]"`
 }
 
+type WorktreeConfig struct {
+	// Default parent directory for new worktrees. It is offered as a candidate location alongside the parent directories of any worktrees you already have.
+	// A relative path is resolved against the repository's root directory, so "../worktrees" sits beside the repo and ".worktrees" sits inside it.
+	DefaultPath string `yaml:"defaultPath"`
+}
+
 type UpdateConfig struct {
 	// One of: 'prompt' (default) | 'background' | 'never'
 	Method string `yaml:"method" jsonschema:"enum=prompt,enum=background,enum=never"`
@@ -959,6 +967,9 @@ func GetDefaultConfigForPlatform(platform string) *UserConfig {
 			ParseEmoji:                   false,
 			TruncateCopiedCommitHashesTo: 12,
 		},
+		Worktree: WorktreeConfig{
+			DefaultPath: "",
+		},
 		Refresher: RefresherConfig{
 			RefreshInterval:             10,
 			FetchInterval:               60,

schema-master/config.json

@@ -3834,6 +3834,10 @@
           "$ref": "#/$defs/GitConfig",
           "description": "Config relating to git"
         },
+        "worktree": {
+          "$ref": "#/$defs/WorktreeConfig",
+          "description": "Config relating to git worktrees"
+        },
         "update": {
           "$ref": "#/$defs/UpdateConfig",
           "description": "Periodic update checks"
@@ -3899,6 +3903,17 @@
       },
       "additionalProperties": false,
       "type": "object"
+    },
+    "WorktreeConfig": {
+      "properties": {
+        "defaultPath": {
+          "type": "string",
+          "description": "Default parent directory for new worktrees. It is offered as a candidate location alongside the parent directories of any worktrees you already have.\nA relative path is resolved against the repository's root directory, so \"../worktrees\" sits beside the repo and \".worktrees\" sits inside it."
+        }
+      },
+      "additionalProperties": false,
+      "type": "object",
+      "description": "Config relating to git worktrees"
     }
   }
 }