[Fix] Subtasks process queued feedback before returning

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What changed

Streaming API input is normalized and enqueued directly in the extension host so it cannot race child completion through an asynchronous webview round trip. Text is trimmed, supplied images receive synchronous count/type/deduplication/size validation, and callers get a rejected promise when normalization leaves no usable input instead of a silently dropped message.

The VS Code e2e queues input while a child is completing, verifies the child processes it, and only then allows the parent to resume. Focused tests cover streaming validation, rejection and logging, image budgets, headless delivery, and the child-only request boundary. The MCP fixture still launches the VS Code Electron executable in Node mode because the inherited pnpm executable emits non-JSON output and prevents the MCP e2e suite from starting.

Why this change was made

Queued instructions could be lost when a delegated child reached completion while the API/webview path was still delivering the message. Direct synchronous queue delivery closes that race without weakening image validation or silently accepting unusable input. This addresses #1308 within the task-lifecycle work tracked by #355.

Impact

Subtasks process validated queued steering feedback before returning control to their parent. Streaming API callers can handle rejected empty/invalid payloads explicitly. The branch is rebased onto current main; full unit tests, complete mocked VS Code e2e, lint, type checks, formatting, docs checks, and changed-line mutation testing pass locally.

Linked work items

Closes #1308
Tracked under #355

Related PRs

• Documentation: [Docs] Clarify queued feedback during subtask completion Zoo-Code-Docs#39

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