fix(acp): separate v2 thinking blocks - #65
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Summary
Preserve ACP v2 reasoning-part boundaries by assigning each AgentKit reasoning part a distinct thought message ID. This restores separate thinking blocks in clients that group streamed chunks by message ID.
Motivation
The ACP v2 integration reused one thought message ID for all reasoning parts between tool boundaries, causing the TUI and desktop app to append distinct thinking sections into a single block.
Technical details
Streaming and response replacement
Chunks from the same reasoning part retain one stable message ID, while separate parts receive distinct IDs. Cancellation and superseded-response cleanup now clears every active thought message rather than only the latest one.