examples/full_project: docker-compose, seed_and_test, README for end-to-end demo (Postgres 5433, MySQL 3307)

Add Postgres, SQLite, and full MySQL smoke scripts

Add docker-compose for MySQL and MySQL IR smoke script; verified SQLite and MySQL smokes

Rust IR builder: RETURNING support, array types, chunked insert-many, timings; Python shim executes IR via Rust; base64 fix; Postgres smoke passing

chore: remove tests from develop; ignore tests; skip CI tests

Merge pull request #5 from Diman2003/feature/rust-route-all-io

ci: shard tests; Rust IR CTE + filters/joins; PG arrays/JSON; docs+tests

chore: add docker-compose for Postgres and scripts/run_pg_tests.sh

chore: remove unused modules (cli_performance, connection, logging); prune unused Rust src files

chore: remove Python backends; update CHANGELOG; stub backends package

feat: enforce Rust-only path; add execute_ir; route Exists to IR; insert IR support; docs toc

feat: add execute_ir shim; route ExistsQuery to IR; docs: add query_ir to TOC

docs: add Query IR usage and examples

feat(builder): add action=update/delete; fix ILIKE/OR groups; expand tests

test(builder): expand multi-dialect coverage (ops, IN, DISTINCT, joins, limits)