Municipals: nest 1,823 city officeholders under their real counties

Pull Atlas's place→county crosswalk (Census TIGER 2024 places × county
geometries, 32,041 places) into the build as a committed raw input, and
use it to resolve municipal officeholders whose county was unknown.

- data/place_county_crosswalk.jsonl — new raw input (place_geoid → county_geoid)
- build.py — place-name+state → county_geoid → ACS county slug as a fallback
  in county_slug(); city_slug() generalized to non-FL bare place labels
- data/sources/sources.yaml — provenance entry for the crosswalk

_unresolved municipals: 1919 → 58. The remainder are genuine: CT planning
regions (post-county), county-level rows mislabeled municipal upstream,
consolidated city-counties (null label), Wikidata-QID placeholder names,
and ambiguous same-name places — left unresolved rather than guessed.

Join key is county_geoid (5-digit FIPS); the directory slug is taken from
the ACS county node so municipals nest under the exact existing county dir.
Deterministic (byte-identical rebuild); validate.py passes 19,721 records.

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

data/jurisdictions/us/states/ia/counties/wright/index.md

@@ -32,7 +32,7 @@ timestamp: "2026-07-03"
 
 # Wright County, IA
 
-County jurisdiction.
+County jurisdiction — 3 officeholders mapped.
 
 ## Demographics (ACS 2023)
 

data/jurisdictions/us/states/ia/counties/wright/municipalities/belmond/people/frank-beminio.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Frank Beminio"
+description: "Mayor, Belmond, IA"
+role: "Mayor, Belmond, IA"
+level: "municipal"
+branch: "executive"
+state: "IA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "34ea716d-7a4e-4989-bba6-bbec69ae19c0"
+  office: "a70ee77f-5274-492d-9ed8-a831722432f3"
+  tenure: "dde65876-3239-4aba-968a-9bee99410d55"
+  jurisdiction: "d5e015ea-8157-483e-9cab-23dbac6209b5"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, ia]
+timestamp: "2026-07-04"
+---
+
+# Frank Beminio
+
+Current Mayor, Belmond, IA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/ia/counties/wright/municipalities/clarion/people/rodney-heiden.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Rodney Heiden"
+description: "Mayor, Clarion, IA"
+role: "Mayor, Clarion, IA"
+level: "municipal"
+branch: "executive"
+state: "IA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "c685d296-ff17-430e-a433-a834634a5ed3"
+  office: "e3055d2c-8036-4760-996e-add7eec3779b"
+  tenure: "8cc8d25d-5d3f-4879-8194-2107d687487c"
+  jurisdiction: "bd948e25-73f1-44ab-9236-57d48ac7142a"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, ia]
+timestamp: "2026-07-04"
+---
+
+# Rodney Heiden
+
+Current Mayor, Clarion, IA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/ia/counties/wright/municipalities/eagle-grove/people/michael-boyd.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Michael Boyd"
+description: "Mayor, Eagle Grove, IA"
+role: "Mayor, Eagle Grove, IA"
+level: "municipal"
+branch: "executive"
+state: "IA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "25ba2c61-0dbb-4f4d-bfc4-29b9e7c66d25"
+  office: "ded0b746-eed2-4caa-bd25-bed39a24deb4"
+  tenure: "05f66429-e794-4f4d-8279-d9dd21781daa"
+  jurisdiction: "563c9558-ffae-4204-90ae-0cf87e95d665"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, ia]
+timestamp: "2026-07-04"
+---
+
+# Michael Boyd
+
+Current Mayor, Eagle Grove, IA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).