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/racine/index.md

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

data/jurisdictions/us/states/wi/counties/racine/municipalities/burlington/people/jon-schultz.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Jon Schultz"
+description: "Mayor, Burlington, WI"
+role: "Mayor, Burlington, WI"
+level: "municipal"
+branch: "executive"
+state: "WI"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "0b3c489a-d785-48c5-b908-5200d21a6e66"
+  office: "afefb7ae-f86b-4a4c-b9f4-7fcca4e70247"
+  tenure: "8c40c3c4-0061-452d-9368-8cf2c8c9f186"
+  jurisdiction: "ba29881a-3b53-4efa-b59d-c6d40f8edf78"
+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"
+---
+
+# Jon Schultz
+
+Current Mayor, Burlington, 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/racine/municipalities/racine/people/john-dickert.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "John Dickert"
+description: "Mayor, Racine, WI"
+role: "Mayor, Racine, WI"
+level: "municipal"
+branch: "executive"
+state: "WI"
+tenure:
+  start: "2009-05-01"
+  current: true
+ids:
+  person: "e6ee3c20-613f-4327-a9a8-d7d50079b107"
+  office: "6494808e-9a85-4abd-91bf-5342d2ab335b"
+  tenure: "2a46e1d5-1005-4e5f-87ca-0656c046c8e7"
+  jurisdiction: "bbbea339-6f9c-4511-9d5e-55e698ae9b0c"
+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"
+---
+
+# John Dickert
+
+Current Mayor, Racine, WI.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).