fix: sync pkg/package.json version with pi-coding-agent to prevent false update banner

pkg/package.json had a hardcoded version (0.1.0) that never got updated.
Since gsd-pi sets PI_PACKAGE_DIR=pkg/, pi's config.js reads VERSION from
pkg/package.json. The update check compares this stale version against npm
registry and always shows 'Update Available' even when the user is already
on the latest release.

Fix:
- Update pkg/package.json to current pi-coding-agent version (0.57.1)
- Add sync-pkg-version.cjs script that reads the installed pi-coding-agent
  version and writes it into pkg/package.json
- Run the sync script in prepublishOnly so the version stays correct on
  every publish

package.json

@@ -37,7 +37,8 @@
     "test": "node --import ./src/resources/extensions/gsd/tests/resolve-ts.mjs --experimental-strip-types --test 'src/resources/extensions/gsd/tests/*.test.ts' 'src/resources/extensions/gsd/tests/*.test.mjs' 'src/tests/*.test.ts'",
     "dev": "tsc --watch",
     "postinstall": "node scripts/postinstall.js",
-    "prepublishOnly": "npm run build"
+    "sync-pkg-version": "node scripts/sync-pkg-version.cjs",
+    "prepublishOnly": "npm run sync-pkg-version && npm run build"
   },
   "dependencies": {
     "@mariozechner/pi-coding-agent": "^0.57.1",

pkg/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@glittercowboy/gsd",
-  "version": "0.1.0",
+  "version": "0.57.1",
   "piConfig": {
     "name": "gsd",
     "configDir": ".gsd"

scripts/sync-pkg-version.cjs

@@ -0,0 +1,30 @@
+#!/usr/bin/env node
+/**
+ * Sync pkg/package.json version with the installed @mariozechner/pi-coding-agent version.
+ *
+ * gsd-pi sets PI_PACKAGE_DIR=pkg/ so that pi's config.js reads piConfig from
+ * pkg/package.json (for branding: name="gsd", configDir=".gsd"). However, config.js
+ * also reads `version` from that same file and uses it for the update check
+ * (comparing against npm registry). If pkg/package.json has a stale version,
+ * pi's update banner fires even when the user is already on the latest release.
+ *
+ * This script reads the actual installed pi-coding-agent version and writes it
+ * into pkg/package.json so VERSION is always correct at publish time.
+ */
+const { readFileSync, writeFileSync } = require('fs')
+const { resolve, join } = require('path')
+
+const root = resolve(__dirname, '..')
+const piPkgPath = join(root, 'node_modules', '@mariozechner', 'pi-coding-agent', 'package.json')
+const gsdPkgPath = join(root, 'pkg', 'package.json')
+
+const piPkg = JSON.parse(readFileSync(piPkgPath, 'utf-8'))
+const gsdPkg = JSON.parse(readFileSync(gsdPkgPath, 'utf-8'))
+
+if (gsdPkg.version !== piPkg.version) {
+  console.log(`[sync-pkg-version] Updating pkg/package.json version: ${gsdPkg.version} → ${piPkg.version}`)
+  gsdPkg.version = piPkg.version
+  writeFileSync(gsdPkgPath, JSON.stringify(gsdPkg, null, 2) + '\n')
+} else {
+  console.log(`[sync-pkg-version] pkg/package.json version already matches: ${piPkg.version}`)
+}