NEWS

pipeflow 0.3.0.9002

Updated descriptions in v04-collect-output.Rmd for better readability.
Enhanced explanations in v06-self-modify-pipeline.Rmd, focusing on the use of the .self parameter and runtime modifications.
Improved wording and fixed typos throughout the document.
Clarified the process of modifying pipeline structure and the importance of returning the modified pipeline object.

C++ DAG engine (src/dag.cpp): All graph operations (node/edge add/remove, topological ordering, reachability queries) run at C++ speed via Rcpp, eliminating R object overhead for dependency resolution.
New pip_* API: Functional API replacing the R6 Pipeline class — pip_new(), pip_add(), pip_run(), pip_replace(), pip_clone(), pip_bind(), pip_view(), pip_tag()/pip_untag(), etc.
Execution modes (auto/split/reduce/plain): Native support for map-reduce style workflows where steps split output into named partitions and downstream steps auto-map over them.
Dependency validation at definition time: pip_add(), pip_replace(), and pip_remove() fail fast on broken references.
New pkgdown-only article pipeflow vs targets (vignettes/articles/v07-vs-targets.Rmd) with an 18-row feature comparison table and benchmarks.

Legacy pipe_* functions and Pipeline R6 class are deprecated (preserved as aliases in R/aliases.R, R/pipelineR6.R).
pip_collect_out() no longer accepts grouped or by parameters. It returns a flat named list of step outputs. Use pip_view() with tags and manual list composition for grouped output.
The group column has been removed from the pipeline data.table. Steps previously using group = "..." in pip_add() should use tags = "...".

Comprehensive revision of all vignettes to match the new pip_* API.
Revised vignettes/v04-collect-output.Rmd to demonstrate tag-based grouping via pip_view() composition.
Updated README with a "Why use {pipeflow}" feature list, a short usage example, and a revised vs-targets summary.

Extensive test suite covering C++ DAG, pip_* API, aliases, execution modes, and recursive runs.
MIT license, updated CI workflows, dependabot config, kilo.json, lintr/styler config.