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/ne/counties/_unresolved/municipalities/_unresolved/people/don-regier.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Don Regier"
+description: "Mayor, Henderson, NE"
+role: "Mayor, Henderson, NE"
+level: "municipal"
+branch: "executive"
+state: "NE"
+tenure:
+  start: "2020-12-01"
+  current: true
+ids:
+  person: "b5d21fb8-fda0-45d9-9d5c-37a610be299a"
+  office: "0bd73ced-2eee-4453-9dd0-b9009afb137a"
+  tenure: "b0956423-3c14-410d-802e-b96a431af927"
+  jurisdiction: "0624a39f-0b47-4f3f-b97c-51c0aec4dc85"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, ne]
+timestamp: "2026-07-04"
+---
+
+# Don Regier
+
+Current Mayor, Henderson, NE.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/ne/counties/_unresolved/municipalities/_unresolved/people/joshua-eickmeier.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Joshua Eickmeier"
+description: "Mayor, Seward, NE"
+role: "Mayor, Seward, NE"
+level: "municipal"
+branch: "executive"
+state: "NE"
+tenure:
+  start: "2010-01-01"
+  current: true
+ids:
+  person: "ba88ac92-6923-48fa-a9b1-2f4889a6ccac"
+  office: "0c11b588-7ec9-46d6-ab67-4c62245d2970"
+  tenure: "a105253d-bc3f-486a-b0d4-c8175184f55f"
+  jurisdiction: "9d06ad16-8110-4014-acdf-746198e17ac6"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, ne]
+timestamp: "2026-07-04"
+---
+
+# Joshua Eickmeier
+
+Current Mayor, Seward, NE.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/ne/counties/_unresolved/municipalities/_unresolved/people/leirion-gaylor-baird.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Leirion Gaylor Baird"
+description: "Mayor, Lincoln, NE"
+role: "Mayor, Lincoln, NE"
+level: "municipal"
+branch: "executive"
+state: "NE"
+tenure:
+  start: "2019-05-20"
+  current: true
+ids:
+  person: "827a878a-2698-462a-b81c-f62c51d7c99a"
+  office: "a422b58d-cc87-4665-8d43-7055509ee002"
+  tenure: "6d0a59e5-49c8-4f7c-a6cb-78710776e532"
+  jurisdiction: "c3f96ae2-eb8f-4aae-9be0-127efd9fcdb8"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, ne]
+timestamp: "2026-07-04"
+---
+
+# Leirion Gaylor Baird
+
+Current Mayor, Lincoln, NE.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/ne/counties/_unresolved/municipalities/_unresolved/people/mayor.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "mayor"
+description: "Mayor, Broken Bow, NE"
+role: "Mayor, Broken Bow, NE"
+level: "municipal"
+branch: "executive"
+state: "NE"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "59a6b983-3da4-4a76-8549-c2c4146413ce"
+  office: "ce339266-aea6-42e8-aa7c-3934e3f9e5cf"
+  tenure: "5621796e-e57a-435b-b095-cc79dc6a2eb3"
+  jurisdiction: "8e2009cb-1f9a-4d7c-8214-f0ece2becd28"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, ne]
+timestamp: "2026-07-04"
+---
+
+# mayor
+
+Current Mayor, Broken Bow, NE.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).