Draft: fix failing pipeline

Summary

The pipeline was failing due to:

1. 3 Vale linting errors in docs/design-documents/indexing/code_indexing.md
2. Commitlint validation errors in the MR title check caused by the "Draft: " prefix not being stripped before validation

Changes

• Fixed Vale linting errors in code_indexing.md:

  • Line 100: Removed possessive form - changed GitLab's Git storage service → GitLab Git storage service
  • Line 204: Changed code fence language from ```text → ```plaintext (allowed language)
  • Line 357: Changed code fence language from ```text → ```plaintext (allowed language)

• Fixed MR title check in scripts/check-mr-title.sh:

  • Added logic to strip "Draft: " prefix (case-insensitive) before passing title to commitlint
  • Handles "Draft:", "draft:", and "DRAFT:" prefixes
  • Preserves titles without the prefix unchanged

Verification

All fixes were verified by:

• ✓ Examining file contents to confirm changes at the correct lines
• ✓ Testing the sed command with multiple test cases (Draft:, draft:, DRAFT:, no prefix)
• ✓ Confirming alignment with Vale and commitlint configuration rules

Expected Outcome:

• ✓ check-docs job will pass with 0 Vale errors
• ✓ mr-title-check job will pass with valid commitlint validation
• ✓ Pipeline will proceed to subsequent stages

---

Fixes failing pipeline on !366

Session 3007318