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/wi/counties/washington/index.md

@@ -32,7 +32,7 @@ timestamp: "2026-07-03"
 
 # Washington County, WI
 
-County jurisdiction.
+County jurisdiction — 2 officeholders mapped.
 
 ## Demographics (ACS 2023)
 

data/jurisdictions/us/states/wi/counties/washington/municipalities/hartford/people/timothy-michalak.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Timothy Michalak"
+description: "Mayor, Hartford, WI"
+role: "Mayor, Hartford, WI"
+level: "municipal"
+branch: "executive"
+state: "WI"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "b9db09bb-adb8-4471-ae01-dddb29d3c806"
+  office: "3c58be8b-5cef-4aef-8caf-67f568e2b99b"
+  tenure: "771f5e94-0bf4-4c89-ace4-ced39749a4d2"
+  jurisdiction: "382d1c2a-86d6-43ef-b55e-6da35b202de2"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, wi]
+timestamp: "2026-07-04"
+---
+
+# Timothy Michalak
+
+Current Mayor, Hartford, WI.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/wi/counties/washington/municipalities/west-bend/people/joel-ongert.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Joel Ongert"
+description: "Mayor, West Bend, WI"
+role: "Mayor, West Bend, WI"
+level: "municipal"
+branch: "executive"
+state: "WI"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "deefb5e3-3aca-482b-9da2-5f009d1809c7"
+  office: "7ea189ee-5dc2-402e-bfb5-35ace0d78308"
+  tenure: "22e599fe-d052-4468-a799-f3df535f239b"
+  jurisdiction: "a79c84f4-83c6-49ac-82e4-d665d51c770e"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, wi]
+timestamp: "2026-07-04"
+---
+
+# Joel Ongert
+
+Current Mayor, West Bend, WI.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).