fix(acp): assign message ids to streamed content

[huntharo]

Motivation

I've been building Kimi support for PwrAgent, which works with Codex App Server and other agents via ACP. I signed up to a Kimi paid plan to add Kimi support via ACP, but unfortunately the support is missing just a couple of little features/fixes that make it work perfectly. I have been able to work around these to a degree, but Kimi would be easier for other ACP consumers to use if these were addressed.

• This PR
  • Add messageId after upgrading to ACP 0.10.0
  • This makes it easier to update the correct streaming response
• fix(acp): replay loaded session history #2363
  • Includes the commits from this PR so it gets the 0.10.0 bump and stable messageIds
  • Advertises a meta capability to indicate that the true thread history will be replayed by the session/load
  • Replays the thread history on session/load
• feat(acp): support permission mode switching #2364
  • Currently, it is possible to put Kimi ACP into Yolo or Default mode by sending /yolo but it's a toggle as I understand it, so it turns it on of off
  • But at a protocol level, it's not possible to deterministically move into yolo or default mode while also knowing what mode you landed in
  • Adds support for session/set_mode to set the permission mode and current_mode_update to notify of the change

Summary

I fixed ACP streamed assistant content so each contiguous thought/message run gets a stable ACP messageId, while separate runs get distinct UUIDs. This lets clients distinguish token chunks for one transcript item from a new assistant message after a tool boundary.

This bumps agent-client-protocol from 0.8.0 to 0.10.0 because 0.10.0 adds the messageId field to AgentMessageChunk and AgentThoughtChunk. I also updated terminal auth method construction for the 0.10.0 schema.

Note that it's possible to fix this without messageId fields but it's much better for the agent to be declaring message boundaries than for the client to be inferring them.

Verification

I verified the ACP-focused test suite and touched-file checks:

• uv run pytest tests/acp tests/ui_and_conv/test_acp_convert.py tests/ui_and_conv/test_acp_server_auth.py -q
• uv run ruff check src/kimi_cli/acp/session.py src/kimi_cli/acp/server.py tests/acp/test_session_notifications.py tests/acp/test_server_initialize.py tests/ui_and_conv/test_acp_server_auth.py
• uv run ruff format --check src/kimi_cli/acp/session.py src/kimi_cli/acp/server.py tests/acp/test_session_notifications.py tests/acp/test_server_initialize.py tests/ui_and_conv/test_acp_server_auth.py
• uv run pyright src/kimi_cli/acp/session.py src/kimi_cli/acp/server.py

Screenshot

Testing with

After - messageId Allow Distinct In-Turn Reply Messages

Use a CLI like the following to point pwrdrvr/PwrAgent#556 at the locally checked out Kimi CLI with the fix:

PATH="/Users/huntharo/.codex/worktrees/mpjxx6jo/kimi-cli/.venv/bin:$PATH" \
PWRAGENT_PROFILE=dev \
pnpm dev:no-messaging

Before - Missing Item IDs Caused Intermediate Messages to be Overwritten

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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[chatgpt-codex-connector]

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