v0.1.0

Added

• Canonical session model and core traits.
• claude_code, codex, pi, campfire, opencode, and Cursor harnesses.
• txcript CLI with list and cross-harness continue.
• Composable TextCodec layer and WASM bindings.

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• crates.io: https://crates.io/crates/txcript/0.1.0
• npm: https://www.npmjs.com/package/txcript/v/0.1.0
• docs.rs: https://docs.rs/txcript/0.1.0