feat: move integrations from lib to ext
feat: move content export from lib to ext
feat: rename affected packages for separate module distribution
chore: update Gradle module wiring
chore: adjust JPMS descriptors and dependencies
docs: update module structure documentation
fix: harden FsCodec determinism and persisted type round-trips
fix: align CSR PoP verification with standards-compatible signature validation
fix: make async approval deny propagation deterministic in signing bus tests
chore: reduce IDE/Gradle drift by strengthening regression coverage
