Mantle 0.1.0

Mantle 0.1.0 introduces Codex sessions alongside Claude Code on Substrate-confined remote workers.

• Select pinned Codex 0.153.4 and ChatGPT device login in the session manifest; Claude remains the default.
• Start and attach use the existing Substrate terminal transport for both agents. Codex no longer requires the proposed non-recording capture feature.
• Keep Codex auth and conversation files in its private workspace home, runtime diagnostics on verified tmpfs, and launcher replay in memory.
• Provision workers independently of Claude credentials, admit the two fixed Codex subscription destinations, and keep terminal attachments cancellable under backpressure.
• Updated examples and documentation explain setup, capture behavior and current limits.

This is an early source release. Substrate may retain terminal output; it is not an end-to-end non-recording mode. Real device login, authenticated model/tool turns, token refresh and complete live lifecycle parity remain unverified. The release contains source archives; this repository does not yet publish prebuilt release binaries.