fix: use cwd fallback for project config path when no git repo detected

`Instance.worktree` returns `/` for non-git projects, causing config
writes to `/.altimate-code/`. Now falls back to `Instance.directory`
(the actual cwd) via `projectRoot()` helper.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: suryaiyer95

packages/opencode/src/altimate/tools/datamate.ts

@@ -12,6 +12,12 @@ import {
 import { Instance } from "../../project/instance"
 import { Global } from "../../global"
 
+/** Project root for config resolution — falls back to cwd when no git repo is detected. */
+function projectRoot() {
+  const wt = Instance.worktree
+  return wt === "/" ? Instance.directory : wt
+}
+
 export function slugify(name: string): string {
   return name
     .toLowerCase()
@@ -169,7 +175,7 @@ async function handleAdd(args: { datamate_id?: string; name?: string; scope?: "p
 
     // Always save to config first so it persists for future sessions
     const isGlobal = args.scope === "global"
-    const configPath = await resolveConfigPath(isGlobal ? Global.Path.config : Instance.worktree, isGlobal)
+    const configPath = await resolveConfigPath(isGlobal ? Global.Path.config : projectRoot(), isGlobal)
     await addMcpToConfig(serverName, mcpConfig, configPath)
 
     await MCP.add(serverName, mcpConfig)
@@ -307,7 +313,7 @@ async function handleDelete(args: { datamate_id?: string }) {
     }
 
     // Remove from all config files
-    const configPaths = await findAllConfigPaths(Instance.worktree, Global.Path.config)
+    const configPaths = await findAllConfigPaths(projectRoot(), Global.Path.config)
     const removedFrom: string[] = []
     const serverName = `datamate-${slugify(datamate.name)}`
     for (const configPath of configPaths) {
@@ -393,7 +399,7 @@ async function handleRemove(args: { server_name?: string; scope?: "project" | "g
       }
     }
     if (scope === "project") {
-      const projectPath = await resolveConfigPath(Instance.worktree)
+      const projectPath = await resolveConfigPath(projectRoot())
       if (await removeMcpFromConfig(args.server_name, projectPath)) {
         removed.push(projectPath)
       }
@@ -420,12 +426,12 @@ async function handleRemove(args: { server_name?: string; scope?: "project" | "g
 
 async function handleListConfig() {
   try {
-    const configPaths = await findAllConfigPaths(Instance.worktree, Global.Path.config)
+    const configPaths = await findAllConfigPaths(projectRoot(), Global.Path.config)
     if (configPaths.length === 0) {
       return {
         title: "Datamate config: no config files found",
         metadata: {},
-        output: `No config files found.\n\nProject config would be at: ${Instance.worktree}/altimate-code.json\nGlobal config would be at: ${Global.Path.config}/altimate-code.json`,
+        output: `No config files found.\n\nProject config would be at: ${projectRoot()}/altimate-code.json\nGlobal config would be at: ${Global.Path.config}/altimate-code.json`,
       }
     }