Refactor session ownership, turn cancellation, and tool execution - #198

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions-rs/toolchain@16499b5e05bf2e26879000db0c1d13f7e13fa3af, Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/