fix: sync standards from v2, not main

The workflow held two defaults for the same value and they disagreed: the
dispatch input defaulted to v2 while the `with:` fallback -- the one a scheduled
run uses, because cron supplies no inputs -- said main. So manual syncs read v2
and the monthly sync read main, and this repository took whichever branch had
spoken last. That is what flipped LICENSE between 2026 and 2025 every month.

main has not moved in evergine-standards since 2026-03-19; v2 is twenty commits
ahead and is what this workflow already pins for the reusable itself.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: jcant0n

.github/workflows/sync-standards.yml

@@ -49,7 +49,7 @@ jobs:
     with:
       org:  ${{ github.event.inputs.org  || 'EvergineTeam' }}
       repo: ${{ github.event.inputs.repo || 'evergine-standards' }}
-      ref:  ${{ github.event.inputs.ref  || 'main' }}
+      ref:  ${{ github.event.inputs.ref  || 'v2' }}
       target_branch: ${{ github.event.inputs.target_branch || 'main' }}
       script_path: ${{ github.event.inputs.script_path || 'sync-standards.ps1' }}
       commit_message: "${{ github.event.inputs.commit_message || vars.STANDARDS_COMMIT_MESSAGE || 'auto: sync standard files [skip ci]' }}"