feat: Adopt HistoryApi.TruncateAsync for user-initiated history reset

[PureWeen]

Context

SDK v0.2.2 added HistoryApi.TruncateAsync(sessionId, cancellationToken) to truncate session history. Also HistoryApi.CompactAsync() replaced the removed CompactionApi.

Opportunity

Could enable a "Clear history" or "Reset conversation" feature in the session context menu. Currently the only way to reset history is to create a new session.

Current State

• Auto-compaction is adopted via InfiniteSessions { Enabled = true }
• Manual compaction (CompactAsync) is not used
• No truncation capability exists in the UI

Priority

Low — nice-to-have UX improvement, no pressing user need.

[github-actions]

✅ Agent Fix completed successfully!

[github-actions]

Pull request created: #813

Generated by Agent Fix

[github-actions]

🔧 Fix Implemented

PR created with the following changes:

What changed

• New ClearHistoryAsync in CopilotService — calls SDK v0.2.2 HistoryApi.TruncateAsync() for server-side history truncation, then clears local UI state. Gracefully falls back to local-only clear if the SDK call fails.
• 🧹 Reset Conversation context menu item added to session right-click menu (hidden while processing)
• /clear command upgraded to use async version with server-side truncation
• 3 unit tests + 1 integration test added

Test results

• ✅ 3664/3664 unit tests passed
• ✅ Integration tests build successfully
• 🚀 Expert review dispatched (3-model adversarial)
• 🚀 Verify build dispatched
• 🚀 Integration test smoke run dispatched

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Generated by Agent Fix for issue #645 · ● 34.2M · ◷