### AUDIT SIG-10 — Geographic Telegraphing in Distractors → `distractor_quality`

**Trigger:** Fires for MCQ/MSQ questions where the question stem explicitly names a specific geographic or cultural region (e.g., "American Southwest", "Great Plains", "Eastern Woodlands", "Mediterranean", "Mesoamerica") and at least one selectable answer option also names that same region.

**Emit `sig10_geo_telegraph` in `distractor_quality.internal_reasoning`:**
```
sig10_geo_telegraph:
  region_named_in_stem: [copy the exact region name or phrase from the stem]
  correct_answer_option_key: [the key letter of the correct answer]
  correct_answer_mentions_same_region: [YES / NO]
  distractor_options_mentioning_same_region: [list option keys, or NONE]
  distractor_options_mentioning_different_regions: [list option keys and the different regions they mention]
```
**MUST-FAIL:** If `correct_answer_mentions_same_region: YES` AND `distractor_options_mentioning_same_region: NONE` AND `distractor_options_mentioning_different_regions` is non-empty → `distractor_quality = 0.0`.

When the stem names a region and the correct answer is the only option that also names that region, students can identify the correct answer by simple keyword matching rather than subject knowledge. All distractors must either (a) also be situated within the same named region, or (b) the stem must remove the geographic constraint so that region-matching no longer telegraphs the answer.
