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Changelog

All notable changes to ArqonHPO will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[0.3.0] - 2026-01-09

Added

  • Safety Executor — Centralized config updates with guardrails
  • Guardrails presets — Conservative, Balanced, Aggressive
  • Rollback Policy — Automatic revert on regressions
  • Dashboard API — REST endpoints for monitoring
  • TUI — Terminal interface for real-time monitoring
  • TPE Strategy — Tree-structured Parzen Estimator
  • ArqonProbe.sample_range() — Batch LDS sampling
  • ask_one() — Single candidate for online mode

Changed

  • probe_budget config → probe_ratio (breaking)
  • Default batch size 4 → auto-scaled by budget
  • Improved SPSA gradient estimation with trimmed mean

Fixed

  • Memory leak in TPE kernel caching
  • Race condition in audit queue flush

Documentation

  • Comprehensive reference docs (40+ pages)
  • TUI/Dashboard screenshots
  • Integration guides (K8s, FastAPI, Ray)

[0.2.0] - 2025-09-15

Added

  • PCR Algorithm — Probe-Classify-Refine pipeline
  • Python bindings — ArqonSolver, ArqonProbe
  • ResidualDecayClassifier — Landscape classification
  • Multi-Start Nelder-Mead — Multimodal optimization
  • Scott's Rule TPE Bandwidth — Adaptive kernel bandwidth
  • CLI commands: ask, tell, interactive, validate

Changed

  • Renamed CLI: arqon → arqonhpo
  • Renamed package: arqon → arqonhpo

Documentation

  • Initial MkDocs site
  • Quickstart guide
  • Python/Rust reference

[0.1.0] - 2025-06-01

Added

  • Initial release
  • Nelder-Mead simplex optimizer
  • Basic CLI: run command
  • Deterministic RNG with ChaCha8
  • State persistence (JSON)
  • Prometheus metrics endpoint

Upgrade Notes

0.2 → 0.3

  • Rename probe_budget to probe_ratio in config
  • Update imports: from arqonhpo import ArqonSolver
  • Re-export artifacts (schema change)

See Migration Guide for details.

0.1 → 0.2

  • Complete config rewrite — recreate configs
  • Package renamed — update pip install