v0.3.0

What's Changed

• ci: Homebrew-install e2e deps + post-release formula smoke test by @redscaresu in #24
• ci: add zizmor supply-chain gate and harden all workflows by @redscaresu in #25
• docs(guide): add brew install path to the operator playbook by @redscaresu in #26
• feat(#27): agent ergonomics — doctor preflight, JSON surfaces, git-free config read by @redscaresu in #31
• mirror(#15): authoritative reconciliation line + pinned clone layout by @redscaresu in #32
• guide(#30): machine-readable capabilities catalogue via guide --json by @redscaresu in #33
• schema(#27 §4): JSON Schema for the lockfile and every machine payload by @redscaresu in #34
• feat(workspaces): list/prune snapshot workspaces + mirror sidecar manifest (#29) by @redscaresu in #36
• release: fix matrix create-race + generated release notes by @redscaresu in #37

Full Changelog: v0.2.1...v0.3.0