docs: add OJP 0.3.2-beta release feature summary

[Copilot]

No v0.3.2-beta tag exists yet (v0.3.1-beta is the latest); this creates a comprehensive, conversational feature summary covering everything merged since that tag — intended as the source material for the release article.

New file: documents/RELEASE_NOTES_0.3.2-beta.md

Spring Boot Starter

• New spring-boot-starter-ojp module — auto-detects OJP JDBC URLs, sets driver class and SimpleDriverDataSource automatically; supports named datasource pool prefixing via URL syntax jdbc:ojp[host:port(name)]_...
• Upgraded to Spring Boot 4.0.3; fixes NoClassDefFoundError on SB4 startup

XA Transactions

• Connection Pool Provider SPI: ojp-datasource-api, ojp-datasource-dbcp, ojp-datasource-hikari, ojp-xa-pool-commons (Apache Commons Pool 2, see ADR-006)
• All six XA operations refactored to Action pattern; SQL Server XA support added
• Multinode pool rebalancing race condition fixed; runtime-configurable transaction isolation

OpenTelemetry

• Distributed tracing via Zipkin or OTLP (disabled by default)
• Granular flags: ojp.telemetry.grpc.metrics.enabled, ojp.telemetry.pool.metrics.enabled
• SQL execution histograms now label by actual statement text instead of hash
• XA pool metrics (acquisition time, queue depth, wait time) aligned with HikariCP

Security

• mTLS for client↔server gRPC channel; SSL cert path placeholder support in JDBC URLs
• CVEs patched: logback-core (CVE-2026-1225), jackson-core DoS (CVSS 8), assertj XXE, gRPC/Netty upgrades

Other

• Full java.time parameter support (LocalDate, Instant, OffsetDateTime, etc.) across all 8 supported databases
• New ojp-testcontainers module (OjpContainer) published to Maven Central
• Per-datasource circuit breaker via Registry pattern
• Slow query segregation now disabled by default
• connectToSingleServer() removed — unified multinode-capable path always used
• Java 21 virtual thread compatibility (ReentrantLock replaces synchronized)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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