Bump Gradle to 9.6.1, refresh dependencies, and document the 3.2.1 release

[pambrose]

Summary

Maintenance release (3.2.1). Upgrades Gradle, refreshes dependencies, refines the build's pre-release version filter, and documents the release across all the usual files. No functional changes to the running server — a drop-in bump from 3.2.0.

Changes

Build & dependencies

• Gradle wrapper 9.5.1 → 9.6.1
• Version-catalog bumps: common-utils 2.9.2 → 2.9.3, Ktor 3.5.0 → 3.5.1, Exposed 1.3.0 → 1.3.1, Kotest 6.2.0 → 6.2.1, Flyway 12.8.1 → 12.10.0, PostgreSQL driver 42.7.11 → 42.7.12, Cloud SQL socket factory 1.28.4 → 1.28.6, Playwright 1.60.0 → 1.61.0, detekt 2.0.0-alpha.4 → 2.0.0-alpha.5, maven-publish 0.36.0 → 0.37.0
• Reworked configureVersions() so a pre-release candidate is rejected only when the current version is stable — dependencies tracked on a pre-release line (e.g. the detekt 2.0 alpha) still surface newer pre-releases. The qualifier regex now handles both dash-style (-alpha) and dot-style (.Beta1) suffixes while leaving stable classifiers (-jre / .Final / -macos) alone. The dependencyUpdates task is marked incompatible with the configuration cache

Test support

• TestSupport.forEachAnswer now accepts a suspend block, matching the suspend functionInfo() call site introduced in 3.2.0

Docs & release notes (3.2.1)

• New 3.2.1 sections in CHANGELOG.md, RELEASE_NOTES.md, and the website release notes
• Refreshed version references in llms.txt, README.md, and CLAUDE.md
• gradle.properties version → 3.2.1

Test plan

• make build / ./gradlew build -xtest
• make tests / ./gradlew check
• make lint

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