chore: add generated migration to gitignore

tests/sqlx/migrations/001_install_eql.sql is built from src/
and should never be committed.

Author: tobyhede

.gitignore

@@ -207,10 +207,6 @@ __pycache__
 
 # dbdev
 eql--*.sql
-# Documentation files (kept locally but not committed)
-tests/sqlx/TEST_MIGRATION_COVERAGE.md
-tests/sqlx/COVERAGE_IMPROVEMENTS.md
-tests/sqlx/RETROSPECTIVE.md
-docs/retrospectives/
-CODE_REVIEW_BATCH_*.md
-docs/plans/*-complete-*.md
+
+# Generated SQLx migration (built from src/, never commit)
+tests/sqlx/migrations/001_install_eql.sql