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GitHub rewrote Copilot’s 800,000-line agent runtime in Rust with agents doing most of the coding

The useful part is not the 800,000-line headline. GitHub has published unusually detailed receipts for a production-scale agent-assisted migration: roughly $120,000 of token spend, 14.5 weeks of incremental releases, dozens of regressions, extensive compatibility tests and a workload-specific jump from 7.55 to 120 session lifecycles per second.

GitHub Enterprise Server 3.22 brings Copilot CLI into disconnected and air-gapped environments

The technical-preview feature separates Copilot CLI from GitHub Cloud for core coding, shell and repository workflows, giving regulated and isolated environments a supported agent path while leaving cloud-dependent capabilities such as GitHub-hosted model selection and web search unavailable.

GitHub Copilot is moving enterprise seats to upfront billing and longer chat retention

From September and October, Copilot Business and Enterprise seat access becomes more tightly coupled to upfront payment. A separate September 28 policy migration enables a unified Copilot experience by default, retains github.com chat data for the life of the account and changes code review’s default effort from Lite to Balanced.

Cloudflare Worker Previews gives every Git branch its own isolated runtime

Branch previews are common for frontend code, but Worker Previews extends the boundary to the runtime itself. Each branch can have independent bindings, state and logs, making parallel human and agent work safer while preserving a production-like execution path.

TRACE gives AI agents a portable, hardware-attested runtime evidence format

TRACE targets a gap between audit promises and what an AI agent actually did at runtime. Its v0.2 developer preview can bind model, policy, data and tool-use claims to confidential-computing attestation, but it is still pre-ratification and explicitly not ready to treat as a production compliance guarantee.

GitHub Actions is starting runtime brownouts for outdated self-hosted runners

Teams with pinned, custom-image or auto-update-disabled GitHub Actions runners can now see registration or job execution fail before the September 25 cutoff. The migration is not just a one-time jump to v2.329.0: already-registered runners must also stay within 30 days of the latest runner release.

Bun 1.4 rewrites the runtime in Rust and moves closer to Node.js 26 compatibility

Bun 1.4 combines an implementation-language rewrite with a larger built-in standard library and a substantial Node-compatibility push. For teams already running Bun, the practical task is to validate native addons, runtime behavior and workload-specific performance rather than treating this as a drop-in minor upgrade.

Microsoft Project Zenith turns 64GB-class Windows PCs into a standardized local-AI developer tier

Project Zenith is not a new model or another Copilot feature. It standardizes a developer-focused Windows experience and hardware floor for local AI work, with preconfigured tooling and OS settings intended to reduce setup friction and dependence on metered cloud inference.