v0.4.0

This is the first tagged release since copperhead@0.3.0. It bundles everything merged to main since then: run observability, audit-trail hardening, agent-loop robustness, a full docs site, and contributor tooling. No open pull requests are included.

Install or upgrade:

npm install -g copperhead@0.4.0

Run observability and safety

• Record full run metadata and surface interactive progress across the CLI, JSON, and transcript surfaces (#26, #28).
• Route --json progress to stderr and keep the interactive renderer usable across repeated runs (#28).
• Preserve failed-run audit trails: run-end and summary.md still land even when rollback itself fails (#27).
• Harden the git preflight: clear messages when HEAD is unborn, with offline scenario coverage (#28).

Agent loop and create pipeline

• Prompt to continue on turn exhaustion, plus agent-loop efficiency fixes (#18).
• Validate KiCad edits with a load probe: an edit that corrupts a loadable schematic is reverted with the kicad-cli reason, and an already-unloadable schematic no longer deadlocks repair.
• Enforce create-stage completion so a blank bootstrap sheet cannot advance the pipeline.

Documentation

• Migrate docs to Astro Starlight with an agent-docs structure, served from its own subdomain, with llms.txt.
• Add brand assets, favicons, and social cards.
• Add worked examples across all tiers with rendered board images (#20).

Contributor tooling

• Add a PR template, a PR body-lint check, and the pr-review skill, with results posted back as a PR comment (#39, #43).
• Ship the NOTICE file and the CLA, and add the roadmap backed by OpenSpec changes.

Notes

• Phase 1 remains pending live-LLM verification: the AC-3.x integration tests skip without an API key, so the end-to-end agent loop has not yet been observed passing against a real model.