v0.2.0

Changed

• Refresh the Claude Code attestation envelope from a local 2.1.220 Opus 5 request capture, including the sdk-cli user agent, current beta set, request-derived billing block, and structured metadata.user_id.
• Add the stable Claude Code 2.1.220 Opus 5 harness core for claude-opus-5 while retaining OpenCode project, environment, and user context.
• Replace raw OpenCode session headers with x-claude-code-session-id and normalize prompt-cache markers to Claude Code's four-breakpoint limit.
• Require a real 64-character Claude Code device ID instead of generating synthetic identities.
• Limit request-body mutation to /v1/messages; model selection, thinking, effort, and token limits remain user-owned.