ci: exercise the full public API in the release smoke test

Since each smoke leg pays for a fresh runner/container spin-up, expand
what one run verifies instead of adding more legs. Smoke.java now
touches essentially every public entry point in the zstd module:

- version/sizing info, core + bounded decompress, zero-copy
  decompressedSize(MemorySegment)
- deterministic error paths (undersized buffer -> DST_SIZE_TOO_SMALL,
  corrupted checksum trailer -> CHECKSUM_WRONG)
- ZstdFrame introspection (byte[] and MemorySegment overloads) and
  skippable frames
- ZstdCompressContext/ZstdDecompressContext: parameters, all reset
  directives, sizeOf(), prefix (delta) compression
- all 6 dictionary training variants, digested compress/decompress
  dictionaries (every constructor), refDictionary
- zero-copy streaming (ZstdCompressStream/ZstdDecompressStream,
  progress()) and java.io streaming (ZstdOutputStream/ZstdInputStream,
  withPledgedSize)
- ZstdBounds for every compress/decompress parameter, ZstdErrorCode
  descriptions

Deliberately excludes multithreaded compression (NB_WORKERS > 0): the
bundled native library is single-threaded, so exercising it would only
prove the parameter is a no-op.

Compiled and run locally against a fresh build (zstd-0.7.jar +
zstd-native-osx-aarch64-0.7.jar) before pushing.

Author: dfa1