Bump version to 3.3.0 and document the release

[pambrose]

Summary

Sets the project version to 3.3.0 and documents the release across the changelog, release notes, llms.txt, and CLAUDE.md.

3.3.0 is a modernization + maintenance release:

• Kotlin collection literals adopted across 191 call sites (emptyList()/listOf(...)/mutableListOf(...) → [...]), enabled via -Xcollection-literals
• Dokka is warning-free after the [initProperties] KDoc-link fix in ContentDsl.kt
• Redundant self-import removals and a behavior-preserving conditional simplification
• Dependency refresh with major bumps: Flyway 13, prometheus-proxy 4.0, common-utils 3.x

No configuration or upgrade steps are required — this is a drop-in bump from 3.2.1, and ./gradlew check is green against the new toolchain.

Changes

• gradle.properties: version 3.2.1 → 3.3.0 (single source of truth for the project version)
• CHANGELOG.md: new [3.3.0] section (Keep a Changelog format: Changed / Fixed / Dependencies)
• RELEASE_NOTES.md: new v3.3.0 section (Highlights / Dependencies / Full Changelog)
• llms.txt: refreshed tech-stack versions; noted collection literals on the Kotlin line
• CLAUDE.md: refreshed Key Dependencies; added a Kotlin Conventions subsection documenting the collection-literal convention, including the DSL-content exemption (the flag doesn't reach the runtime JSR-223 script engine)

Dependency deltas since 3.2.1

Kotlin 2.4.0 → 2.4.10 · common-utils 2.9.3 → 3.2.1 · prometheus-proxy 3.2.0 → 4.0.0 · Flyway 12.10.0 → 13.0.0 · Kotest 6.2.1 → 6.2.3 · Logback 1.5.18 → 1.5.38 · PostgreSQL driver 42.7.12 → 42.7.13 · Cloud SQL socket factory 1.28.6 → 1.29.0 · Kotlinter 5.5.0 → 5.6.0 · Kover 0.9.8 → 0.9.9

Notes

• Docs-and-version-only change; no source/behavior changes in this PR (the code changes it documents already merged in Adopt Kotlin collection literals across src and test #120 and Resolve initProperties KDoc link and remove redundant self-imports #121).
• Release date used in the docs is 2026-07-26 — adjust if the tag lands on a different day.
• The CHANGELOG's bottom compare/... link-refs stopped at 3.1.4 (neither 3.2.0 nor 3.2.1 have one), so none was added for 3.3.0 to match recent precedent.

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