Release/v0.15.4

[lchoquel]

Added

• Enhanced pipelex build Command: Now generates a self-contained directory (e.g., results/pipeline_01/) containing bundle.plx, inputs.json, run_{pipe_code}.py, bundle_view.html, and bundle_view.svg. New CLI options: --output-name (-o) for custom base name, --output-dir for custom directory, and --no-extras to generate only the .plx file.
• CLI Readiness Check: Verifies that a virtual environment is active for development installations.
• Model Deck Presets: Added llm_for_creativity and cheap_llm_for_creativity model waterfalls, plus [cogt.model_deck_config] section in pipelex.toml for configuring model fallback behavior.
• WIP: Groq Inference Backend Support: Integrated full support for the Groq API with configuration file (.pipelex/inference/backends/groq.toml), model specifications, costs, capabilities, new model aliases (base-groq, fast-groq, vision-groq), and routing profile (all_groq).

Changed

• CLI Output and Visualization: Overhauled command-line output with rich, table-based layouts for pipeline components. Final output of pipelex run is now pretty-printed and adapts to content type.
• Documentation: Updated "Get Started" and "Build Reliable AI Workflows" to reflect new directory-based build output and CLI options.
• Internal Code Refactoring: Reorganized exception hierarchy into dedicated exceptions.py files per module, centralized validation logic into validation.py modules, added ValueError to blueprints, and removed unused exceptions for improved maintainability.

Fixed

• Adjusted default temperature for llm_for_testing_gen_object preset from 0.5 to 0.1 for more deterministic structured data generation.
• Corrected LLM_FOR_VISUAL_DESIGN skill in pipe_llm_spec to point to cheap_llm_for_creativity preset.
• Standardized input variable names in pipe_llm_vision.plx from imageA/imageB to image_a/image_b.

Removed

• Deleted pipelex/core/validation_errors.py file as part of exception hierarchy refactoring.