spec: delete orphaned API table row in surfacing section

## Problem

Line 755 has a headerless single table row — leftover from the dedup edit (#431):
```
| API | Haiku (semantic gate via surface_gate_haiku prompt) | One call per prompt, candidates batched |
```

The info is already in the canonical surfacing pipeline (step 6) and the config section.

## Fix

Delete the orphaned row. The info is redundant.

AI-Used: [claude]