Sync: officeholders v3 — fresh export from live Atlas DB (13,329 tenures)

Re-exported directly from Postgres (10.0.0.116), not Atlas's introspection,
which under-reported the roster (its v3 export had 11,473, missing the
restored Florida League of Cities municipal set). Live DB current tenures:
state 7,561 · municipal 4,009 · county 1,217 · federal 542.

- build.py now reads officeholders-v3.jsonl (was v2); dataset vintage 2026-07-04
- fixed one corrupt start_date at source-export (21021-12-03 -> 2021-12-03,
  Lorraine Borowski, Mayor of Decorah IA)
- scripts/build_viz.py: committed, deterministic generator for the Board's
  county_data.json / county_detail.json (previously built ad-hoc)
- generate_changelog.py: ignore files whose only change is the vintage stamp,
  so the diff reflects government change, not re-export bookkeeping

Person files 11,285 -> 13,329. Non-FL municipal officials (1,903) are in the
tree but not yet county-mappable (place->county crosswalk still NULL).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

data/jurisdictions/us/states/fl/counties/polk/people/kate-wallace.md

@@ -1,39 +1,39 @@
 ---
 type: Person
 title: "Kate Wallace"
-description: "Polk County School Board — Polk County, FL"
-role: "Polk County School Board"
+description: "Polk County School Board - District 3 — Polk County, FL"
+role: "Polk County School Board - District 3"
 level: "county"
 branch: "legislative"
 state: "FL"
 tenure:
+  start: "2025-01-01"
   current: true
-  notes: "Role: District 3"
 ids:
-  person: "81659cf8-4f44-4f35-a771-5626d34b280b"
-  office: "4f7a19e3-5250-4edf-ad29-c73d63b7cfcc"
-  tenure: "4897daee-338d-4855-857f-74312fb16467"
-  jurisdiction: "b3c4979a-2dcd-4674-b578-886e52ddc733"
+  person: "a9aa89ba-0e79-4e30-bcce-a547fcb1ad30"
+  office: "30a60a05-6da4-4f60-b016-87989a7e7252"
+  tenure: "86f19e77-70ea-4e1b-8851-4df063af5d5a"
+  jurisdiction: "f8894112-caf5-428a-9e2e-f142723f4d25"
 sources:
   - field: office
-    source: "school-board-scrape-2026-06"
+    source: "Polk County Schools website"
   - field: tenure
-    source: "school-board-scrape-2026-06"
+    source: "Polk County Schools"
   - field: jurisdiction
-    source: "census-tiger-2024-county"
+    source: "Census TIGER 2024"
 confidence: official
 tags: [officeholder, county, legislative, fl]
-timestamp: "2026-06-20"
+timestamp: "2026-07-04"
 ---
 
 # Kate Wallace
 
-Current Polk County School Board (Polk County, FL).
+Current Polk County School Board - District 3 (Polk County, FL).
 
 ## Sources
 
-- office: school-board-scrape-2026-06
-- tenure: school-board-scrape-2026-06
-- jurisdiction: census-tiger-2024-county
+- office: Polk County Schools website
+- tenure: Polk County Schools
+- jurisdiction: Census TIGER 2024
 
-Generated from the Atlas officeholders v2 export (2026-06-20).
+Generated from the Atlas officeholders v3 export (2026-07-04).