Lataa LiveKit CLI 2.19.0

## What's Changed
• Show Agent Simulations launch notice in the CLI banner by @u9g in https://github.com/livekit/livekit-cli/pull/987
• Revert "Show Agent Simulations launch notice in the CLI banner (#987)" by @u9g in https://github.com/livekit/livekit-cli/pull/992
• fix(agent)：show duration units in debugger timeout flags by @bcherry in https://github.com/livekit/livekit-cli/pull/993
• fix(completion)：keep hidden and experimental-auth commands out of help and completion by @bcherry in https://github.com/livekit/livekit-cli/pull/991
• chore(agent)：brand simulate help and TUI as Agent Simulations by @bcherry in https://github.com/livekit/livekit-cli/pull/988
• feat(agents)：lk agent dev uses unique deployment id by default by @rektdeckard in https://github.com/livekit/livekit-cli/pull/995
• fix(simulations)：merge lk simulations into lk agent simulate cmd by @rektdeckard in https://github.com/livekit/livekit-cli/pull/994
• feat(agent)：show dispatch name in the agent picker by @ShayneP in https://github.com/livekit/livekit-cli/pull/989
• build：generate fish completion at release instead of committing it by @u9g in https://github.com/livekit/livekit-cli/pull/999
• fix：correct help text and dead flag references in several commands by @bcherry in https://github.com/livekit/livekit-cli/pull/998
• fix(deps)：update dependency @livekit/rtc-node to v1 by @renovate[bot] in https://github.com/livekit/livekit-cli/pull/1002
• simulate：--samples runs every scenario k times for pass@k / pass^k by @u9g in https://github.com/livekit/livekit-cli/pull/975
• feat(simulate)：require stable ids in scenarios.yaml, offer to add them by @u9g in https://github.com/livekit/livekit-cli/pull/970
• feat：`lk skills`, installs LiveKit's agent skills and Docs MCP server by @bcherry in https://github.com/livekit/livekit-cli/pull/996
• feat(agent)：add audio mode to lk agent debugger by @u9g in https://github.com/livekit/livekit-cli/pull/1000
• chore(public)：regenerate the Public API client by @Topherhindman in https://github.com/livekit/livekit-cli/pull/1013
• feat(agent)：working `--lang` for `lk agent init`, Python default by @u9g in https://github.com/livekit/livekit-cli/pull/984
• Show Agent Simulations launch notice in the CLI banner by @u9g in https://github.com/livekit/livekit-cli/pull/1015
• chore(lk)：bump version to v2.19.0 for release by @rektdeckard in https://github.com/livekit/livekit-cli/pull/1017

## New Contributors
• @ShayneP made their first contribution in https://github.com/livekit/livekit-cli/pull/989

**Full Changelog**：https://github.com/livekit/livekit-cli/compare/v2.18.8...v2.19.0