fix: stop named-importing CallId/ToolCallId from dsh-llm

[yyh-001]

Summary

Desktop / dsh 0.1.2-alpha.1 fails to load @mars-sea/dsh-commandcode-provider@latest (0.9.1) with:

The requested module '@deepseek-ai/dsh-llm' does not provide an export named 'CallId'

@deepseek-ai/dsh-llm renamed the branded CallId constructor to ToolCallId in 0.1.2-alpha.1. A named ESM import of the missing name fails at instantiation and the whole plugin tree dies (deepseek-ai/deepseek-harness#4827).

A previous attempt (#9) switched the named import to ToolCallId, which would then break rc hosts that still export CallId. Copilot's review asked for a namespace fallback instead of a hard named import.

This PR brands tool-call ids through the host StreamChunk vocabulary (Extract<StreamChunk, { type: 'tool-call-delta' }>['id']) and does not import either constructor name. Same pattern as ai/adapt-dsh-0.1.2.

Changes

• src/adapter.ts — local toolCallId() helper; drop ToolCallId from the @deepseek-ai/dsh-llm value import
• tests/adapter.test.ts — regression that the adapter must not named-import CallId or ToolCallId
• CHANGELOG.md — Unreleased note

Test plan

• node --import tsx --test tests/adapter.test.ts (71 pass)
• Confirm a cold boot on dsh 0.1.2-alpha.1 / alpha.2 no longer throws the named-export SyntaxError
• Send a tool-calling turn and confirm tool-call / tool-call-delta ids still round-trip

Note for 0.9.x / @latest

Current main is the 0.10.0-alpha line (@alpha, dsh ≥ 0.1.2-alpha.2). Desktop users on 0.1.2-alpha.1 still install @latest 0.9.1, which is the line that still import { CallId }.

The same adapter change is on yyh-001:fix/0.9.2-callid-compat (based on v0.9.1, version bumped to 0.9.2, peers include 0.1.2-alpha.1). Please cut a 0.9.x branch from v0.9.1 and publish 0.9.2 to the latest tag so Desktop alpha.1 users stop hitting this on install. That branch should not be merged into main.

[yyh-001]

Closing this PR. The supported path is now dsh 0.1.2-alpha.2+ with @mars-sea/dsh-commandcode-provider@alpha (0.10.0-alpha).