feat(interim): include block-he opening in pre-ruling interim drafts

block-he (פתיחה ניטרלית) was previously emitted only in final decisions.
For interim drafts shown to the chair before ruling, including a neutral
opening helps the chair confirm framing before approving downstream blocks.
Skipped if empty, so legacy cases without block-he are unaffected.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

mcp-server/src/legal_mcp/services/docx_exporter.py

@@ -291,6 +291,7 @@ _INTERIM_BLOCK_ORDER = [
     "block-bet",    # panel (skipped if empty)
     "block-gimel",  # parties (skipped if empty)
     "block-dalet",  # "החלטה" title (skipped if empty)
+    "block-he",     # פתיחה ניטרלית (skipped if empty — opt-in for pre-ruling drafts)
     "block-vav",    # רקע עובדתי
     "block-tet",    # תכניות + היתרים (extended)
     "block-zayin",  # טענות הצדדים