[mikemikimike]

Summary

• Reconcile active LLM responses against the negotiated llm.pending capability while settlement is waiting.
• Cancel only responses captured before a successful pending query and confirmed absent; preserve legacy behavior when the capability is unavailable.
• Cover interrupted streams, requests arriving during a query, query failures, and older backends.

Fixes #135

Issue: #135

Tests

• bun run --cwd packages/drive --bun vitest run --maxWorkers=1 --no-file-parallelism test/driver/llm-controller.test.ts test/driver/llm-state.test.ts (27 passed)
• bun run --cwd packages/drive drive check test/manual/tui-regressions/llm-interrupt-settlement.ts (passed)
• bun run test (279 passed; 10 existing Windows-specific failures also reproduce on the base revision)
• bun run check (lint and TypeScript checks passed; the catalog public-path test fails on Windows path handling)

[mikemikimike]

Verification note: bun run test produces the same 10 Windows-specific failures on the clean base commit ec9ad8a and on this PR branch; these failures predate this PR. The focused LLM driver tests pass (27/27). bun run check also reports the catalog public-path Windows path-separator failure on both the base and this branch. Drive lint/typecheck and catalog lint/typecheck pass.