v0.6.8 - Structured Hook History

Fixed

• Hook events now receive complete structured JSON snapshots of conversation messages instead of placeholder objects.
• Post-tool hooks now see the completed tool call and its unmodified pending result.
• Client receive-loop documentation is attached to the correct API.

Changed

• Unified request streaming across stateless and stateful clients and removed no-hook snapshot overhead.
• Split oversized modules into focused include-backed fragments without changing public module paths or APIs.
• Added repository-wide Rust source-size enforcement; every Rust file is below 600 lines.

Verification

• 353 active tests pass on Rust stable and beta across Linux and macOS.
• RustSec, Clippy, rustfmt, rustdoc, Rust 1.85 MSRV, coverage, packaging, and publish gates pass.