fix: pass Godot's bin dir to relay for PATH resolution in GUI launches

addons/github_copilot/consts.gd

@@ -0,0 +1,41 @@
+@tool
+extends RefCounted
+
+## Centralized constants for the GitHub Copilot plugin.
+## Eliminates magic values and ensures consistency across all files.
+
+const PLUGIN_NAME := "GitHub Copilot"
+const PLUGIN_VERSION := "2.1.0"
+const PLUGIN_AUTHOR := "Community"
+const PLUGIN_DESCRIPTION := "GitHub Copilot AI code completion via official LSP server."
+
+const ADDON_PATH := "res://addons/github_copilot/"
+
+const RELAY_SCRIPT_NAME := "copilot_relay.mjs"
+const RELAY_LOG_NAME := "copilot_relay.log"
+
+const DEFAULT_DEBOUNCE_DELAY := 0.65
+const MIN_DEBOUNCE_DELAY := 0.2
+const MAX_DEBOUNCE_DELAY := 3.0
+const DEFAULT_DEBOUNCE_TIMEOUT_SECS := 20.0
+
+const TCP_PORT_MIN := 49200
+const TCP_PORT_MAX := 49300
+
+const AUTH_POLL_INTERVAL := 3.0
+const AUTH_INIT_DELAY := 0.5
+const FEATURE_CHECK_TIMEOUT := 80
+
+const MIN_NODE_VERSION := "20.8"
+const LSP_PACKAGE := "@github/copilot-language-server"
+
+const SETTINGS_FILE := "user://copilot_settings.cfg"
+
+const DEFAULT_GHOST_COLOR := Color(0.52, 0.52, 0.52, 0.65)
+
+const AUTH_STATUS_OK := "OK"
+const AUTH_STATUS_ALREADY_SIGNED_IN := "AlreadySignedIn"
+const AUTH_STATUS_NOT_SIGNED_IN := "NotSignedIn"
+const AUTH_STATUS_NOT_AUTHORIZED := "NotAuthorized"
+
+const AUTOWRAP_WORD := TextServer.AUTOWRAP_WORD