test: comprehensive hypertable integration and unit test coverage

feat: add product_inventory table with composite PK to demo data

test: comprehensive composite PK test coverage (#1-14)

test: add composite primary key tests across all layers

feat: add composite primary key support

ci: bump codecov/codecov-action from 5 to 6

docs: prepare v0.6.0 release

fix: add --insecure-no-ssl to migrate command, fix Docker test TLS

fix: disable TLS enforcement in integration tests

docs: update for v0.6.0 release

fix: use --insecure-no-ssl for Docker demo mount

fix: generate format-specific columns in history triggers

refactor: reorganize demo scripts, seed file-first apps via mount

docs: update migrate help text with all connection formats

test: add integration tests for tigerfs migrate command