stream.toList() (Java 16+) is the simplest way to collect a stream into an unmodifiable list — no collect() call or Collectors import needed. The "Unmodifiable collectors" pattern now highlights this as the primary modern approach.

Changes

• unmodifiable-collectors.json: Promoted stream.toList() to the modern approach (modernCode, modernLabel → "Java 16+", modernApproach, summary, whyModernWins, support). The explanation still covers Java 10's toUnmodifiableList()/toUnmodifiableSet()/toUnmodifiableMap() as context for other collection types. Added both Stream.toList() and Collectors.toUnmodifiableList() Javadoc links in docs. Replaced collections/map-entry-factory in related with streams/stream-tolist.
• stream-tolist.json: Added collections/unmodifiable-collectors to related for bidirectional linking (replacing streams/virtual-thread-executor).
• Regenerated all HTML from updated JSON sources.

// Before (Java 8) — old approach
List<String> list = stream.collect(
    Collectors.collectingAndThen(
        Collectors.toList(),
        Collections::unmodifiableList
    )
);

// After (Java 16+) — modern approach
List<String> list = stream.toList();

• Fixes #collections in "Unmodifiable collectors" suggest using or mention of Stream.toList() #79

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