release: vectors 0.1.6

[bsbodden]

Cuts 0.1.6. This publishes vectors-router — which merged after 0.1.5 and is not on Maven Central at any version — along with the two new semantic-cache decorator modules.

Contents

New modules

• vectors-router (Publish vectors-router to Maven Central #57) — semantic routing by embedding similarity
• vectors-cache-semantic-spring-ai, vectors-cache-semantic-langchain4j (Semantic caching for Spring AI and LangChain4j, with attribute-scoped lookup #58) — chat decorators that answer from a semantically similar earlier prompt

SPI

• SemanticCache gained entry attributes, CacheFilter, lookupTopK, and supportsAttributes()

Fix

• A Spring AI prompt carrying options never hit the semantic cache: the options signature came from DefaultChatOptions.toString(), which is identity-based, so identical option sets produced different signatures

Also documents 0.1.5, which shipped without a changelog entry.

Release steps after merge

Per RELEASING.md:

1. Actions → Release with dry_run enabled
2. Inspect JReleaser validation output and staged POMs
3. Actions → Release with dry_run disabled

Maven Central versions are immutable, so the dry run matters.

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