Add par.0.4.8 and par_cli.0.4.8 (Programmable Agent Runtime)

[jcz2020]

Add par.0.4.8 and par_cli.0.4.8

First release of PAR (Programmable Agent Runtime) — a modular, type-safe agent runtime for OCaml 5.4+. LangChain + LangGraph equivalent for the OCaml ecosystem.

Packages

• par — SDK: core types, ReAct engine, runtime, workflow, expression evaluator, state machine, context manager, event bus, OpenAI/Anthropic providers, SQLite persistence, 20 built-in tools (including type-safe bash), MCP client (stdio + HTTP/SSE), 7 middleware.
• par_cli — CLI tool (par REPL + par config wizard + par ask single-shot). Thin SDK consumer, not a sibling of it.

Highlights of v0.4.8

• New: Runtime.invoke_structured — schema-validated LLM output via JSON Schema (OpenAI native response_format + Anthropic output_config.format).
• Engine feedback repair loop with cancellation + middleware hooks (max 3 attempts on schema violation).
• Generic fallback path for non-native providers (Ollama, Custom providers).
• Mock provider structured support + Python FFI binding (par_runtime on PyPI).

Verification

• 987 OCaml tests + 33 Python tests passing (dune runtest + pytest)
• opam lint Passed for both packages
• Tarball sha512 verified against GitHub Release assets
• CI (4 workflows): https://github.com/jcz2020/par/actions/runs/27878793270
• par --version returns 0.4.8 after opam install

Source

• Project: https://github.com/jcz2020/par
• Release: https://github.com/jcz2020/par/releases/tag/v0.4.8
• Docs: https://github.com/jcz2020/par/tree/main/docs
• Strategic positioning: https://github.com/jcz2020/par/blob/main/docs/STRATEGY.md

Distribution

• opam (this PR): par, par_cli
• PyPI (separate): par-runtime (Python ctypes binding via par_capi.so)
• GitHub Release binaries: linux-x64, macos-arm64 (macos-x64 manual build)

Maintainer: @jcz2020