fix: recover interrupted tool and lsp warmup states

[eatFirewood]

Issue for this PR

Closes #27871

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Fixes two ways a session can get stuck after tool/runtime interruption.

First, read now treats LSP warm-up as best-effort. It explicitly carries the current InstanceRef into the forked warm-up effect and logs any warm-up failure instead of letting that background optimization break a successful file read.

Second, session cleanup now waits only for tool calls that reached running. A pending tool part is still incomplete input assembly, so it cannot produce a real tool result and should be marked interrupted during cleanup instead of awaited.

How did you verify your code works?

• bun test test/tool/read.test.ts
• bun test test/session/processor-effect.test.ts
• bun run --cwd packages/opencode typecheck
• bun run lint -- packages/opencode/src/tool/read.ts packages/opencode/src/session/processor.ts packages/opencode/test/tool/read.test.ts packages/opencode/test/session/processor-effect.test.ts

processor-effect.test.ts needs local port binding and was run outside the sandbox. Lint reports existing warnings in processor.ts, with no new errors.

Screenshots / recordings

Not applicable, no UI change.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

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2. Add Fixes #<number> or Closes #<number> to this PR description

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