fix(vscode): keep active terminal for @terminal context

[marius-kilocode]

Agent Manager now preserves the active VS Code integrated terminal when resolving @terminal context, so Run task output and manually focused integrated terminals can be sent to the model.

It only falls back to the session/worktree terminal when there is no active integrated terminal, avoiding unexpected terminal switches during prompt send.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (5 files)

• .changeset/terminal-context-active.md
• packages/kilo-vscode/src/agent-manager/AgentManagerProvider.ts
• packages/kilo-vscode/src/agent-manager/SessionTerminalManager.ts
• packages/kilo-vscode/tests/unit/agent-manager-arch.test.ts
• packages/kilo-vscode/tests/unit/session-terminal-manager.test.ts

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_{Reviewed by gpt-5.5-20260423 · 539,476 tokens}