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/winneshiek/index.md

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

data/jurisdictions/us/states/ia/counties/winneshiek/municipalities/calmar/people/keith-frana.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Keith Frana"
+description: "Mayor, Calmar, IA"
+role: "Mayor, Calmar, IA"
+level: "municipal"
+branch: "executive"
+state: "IA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "14fbedb5-5d4e-43c7-876a-f0da26a205dd"
+  office: "73e0ba63-bafe-46b2-91dc-d3ee137ac683"
+  tenure: "eda40061-c783-419b-abb8-413a43d134f1"
+  jurisdiction: "366a98cd-80c2-4186-9cd4-16efbef0de1d"
+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"
+---
+
+# Keith Frana
+
+Current Mayor, Calmar, 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/winneshiek/municipalities/decorah/people/lorraine-borowski.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Lorraine Borowski"
+description: "Mayor, Decorah, IA"
+role: "Mayor, Decorah, IA"
+level: "municipal"
+branch: "executive"
+state: "IA"
+tenure:
+  start: "2021-12-03"
+  current: true
+ids:
+  person: "40fa5319-d75e-46f5-8676-ac2e098ec1ff"
+  office: "d7cf3c75-8a50-4333-8863-85993f9f8278"
+  tenure: "7f18cf44-dae6-4106-8c7f-2c775a7673c9"
+  jurisdiction: "b00dc503-1e15-4d58-9e43-2856fd0d0d2c"
+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"
+---
+
+# Lorraine Borowski
+
+Current Mayor, Decorah, 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/winneshiek/municipalities/fort-atkinson/people/paul-herold.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Paul Herold"
+description: "Mayor, Fort Atkinson, IA"
+role: "Mayor, Fort Atkinson, IA"
+level: "municipal"
+branch: "executive"
+state: "IA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "42c763c0-7eed-489e-870e-e18ea6faddcf"
+  office: "eb2ac68a-5cf4-479c-a75d-459e0cbd02b5"
+  tenure: "52f37900-9042-402b-9e59-9a42c9d699bf"
+  jurisdiction: "f14b9776-3785-40fc-99ef-404d2cbd5067"
+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"
+---
+
+# Paul Herold
+
+Current Mayor, Fort Atkinson, IA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).