Tool-call JSON repair

This crate is a local fork of jsonrepair-rs 0.2.1, licensed under MIT. The upstream license is retained in LICENSE.

It retains the upstream generic repair API for compatibility, and adds repair_tool_call_json for OpenBitFun streamed tool arguments. That profile does not interpret #, //, or /* ... */ as comments: tool arguments are JSON, not configuration files. This prevents Markdown content whose opening quote was omitted from being silently discarded as a comment.

The profile still supports bounded syntax recovery needed for malformed model tool arguments, including missing string quotes, commas, and closing delimiters. The caller must parse and schema-validate the result before use.

Upstream regression coverage

The non-CLI regression tests and parity fixture from jsonrepair-rs 0.2.1 are vendored under tests/. They differ only in the local crate import path. The upstream CLI tests are intentionally excluded because this internal library sets autobins = false and does not ship the upstream command-line program.