fix(completions): migrate to open_responses 0.1.5 API

[91jaeminjo]

Problem

soliplex_completions is pinned to open_responses: 0.1.4 because 0.1.5 introduced breaking changes that break compilation of open_responses_llm_provider.dart. Currently pinned as a workaround.

Error 1: List<Item> no longer assignable to input

Lines 132, 175, 218, 246 pass List<Item> to CreateResponseRequest(input: ...). In 0.1.5, input changed from List<Item> to a sealed ResponseInput type.

Error 2: callId removed from streaming events

Lines 306, 314 destructure callId from FunctionCallArgumentsDeltaEvent and FunctionCallArgumentsDoneEvent. In 0.1.5, callId was removed — only itemId remains. The callId is now only on FunctionCallOutputItemResponse (via OutputItemAddedEvent).

Fix

Detailed plan: docs/plans/fix-open-responses-0.1.5.md

Fix 1: Wrap List<Item> in ResponseInput.items() at 4 call sites.

Fix 2: Make _mapStreamingEvent stateful — track itemId → callId mapping from OutputItemAddedEvent, use it in delta/done events, clear on ResponseCompletedEvent.

File to change

packages/soliplex_completions/lib/src/open_responses_llm_provider.dart

After fix

• Unpin open_responses from 0.1.4 back to ^0.1.5 in packages/soliplex_completions/pubspec.yaml
• Verify: dart analyze and dart test in both soliplex_completions and soliplex_agent

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