Fixed: the 0.1.1 Python client could not talk to the server (no MCP envelope
unwrap, wrong PascalCase SessionID handling, register() returned garbage, tool
denials swallowed, broken store() examples). Rebuilt with typed errors, safe
retries, full method coverage, tests, and a live end-to-end verification.

Added:
- Official SDKs in 15 languages (Python + JavaScript, TypeScript, Java, Go, C#,
  PHP, Ruby, Rust, Kotlin, Swift, C++, Dart, Scala, Shell) under clients/.
- New/fixed examples and MCP client configs for the canonical /mcp endpoint.
- GitHub Actions CI: Python tests + a per-language build matrix on every PR.

Default endpoint is now the canonical Streamable-HTTP MCP endpoint
https://priostack.com/mcp (/acn/rpc remains a working alias).

See CHANGELOG.md for details.