fix: silence interrupted session notifications

[marius-kilocode]

Attention sounds currently treat every active-to-idle transition as a completed session. Manual interruption follows the same status transition, so pressing Escape or Stop can produce a misleading completion or error sound.

Use the canonical turn-close outcome in both the CLI and VS Code notification paths. Completion attention now fires only for completed turns, while interrupted turns and abort errors remain silent without changing genuine error, question, or permission notifications.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (5 files)

• .changeset/quiet-interrupted-sessions.md
• packages/kilo-vscode/src/services/attention/service.ts
• packages/kilo-vscode/tests/unit/attention.test.ts
• packages/opencode/src/cli/cmd/tui/feature-plugins/system/notifications.ts
• packages/opencode/test/cli/cmd/tui/notifications.test.ts

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_{Reviewed by deepseek-v4-pro-20260423 · 501,226 tokens}

_{Review guidance: REVIEW.md from base branch main}