-- pg_trickle 0.55.0 -> 0.56.0 upgrade migration
--
-- v0.56.0 — Documentation Foundation
--
-- This release contains no SQL schema changes. All changes are
-- documentation fixes and additions:
--
--   DOC-P0-1: Fix scripts/gen_catalogs.py two-pass GUC scan; regenerate
--             docs/GUC_CATALOG.md with all 115 correct pg_trickle.* names
--   DOC-P0-2: Complete docs/ERRORS.md to cover all 39 PgTrickleError variants
--   DOC-P0-3: Correct pg_trickle.parallel_refresh_mode default to 'on'
--             in docs/CONFIGURATION.md (has been 'on' since v0.11.0)
--   DOC-P1-4: Add examples to outbox/inbox consumer functions in SQL_REFERENCE.md
--   DOC-P1-5: Add catalog table column schemas to SQL_REFERENCE.md
--   DOC-P1-6: Add standalone abstracts to three research stub documents
--   DOC-P1-7: Add Before/After SQL examples to DVM_REWRITE_RULES.md
--   DOC-P1-8: Enrich docs/introduction.md with IVM cycle overview
--   DOC-P1-9: Add docs/MENTAL_MODEL.md (concept-first IVM explainer)
--   DOC-P1-10: Add docs/LIMITATIONS.md (comprehensive unsupported-constructs ref)
--   DOC-NEW-23: Add docs/PERFORMANCE_CHEATSHEET.md (single-page tuning guide)