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/ozaukee/index.md

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

data/jurisdictions/us/states/wi/counties/ozaukee/municipalities/mequon/people/andrew-nerbun.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Andrew Nerbun"
+description: "Mayor, Mequon, WI"
+role: "Mayor, Mequon, WI"
+level: "municipal"
+branch: "executive"
+state: "WI"
+tenure:
+  start: "2022-04-01"
+  current: true
+ids:
+  person: "e89c8fbe-00f4-4c7b-b0d2-2999c6362cd9"
+  office: "e50ebe29-715a-455b-a241-d6e64452f66b"
+  tenure: "49fd2905-53bf-453e-9bcc-692cb9d36544"
+  jurisdiction: "398ce126-132d-4921-92ca-ff652d1e749d"
+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"
+---
+
+# Andrew Nerbun
+
+Current Mayor, Mequon, 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/ozaukee/municipalities/port-washington/people/ted-neitzke-iv.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Ted Neitzke IV"
+description: "Mayor, Port Washington, WI"
+role: "Mayor, Port Washington, WI"
+level: "municipal"
+branch: "executive"
+state: "WI"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "850a2baf-5daa-47ce-8b6e-188f93c586ed"
+  office: "bffa5a4c-a49e-478e-ab05-33d10c928c98"
+  tenure: "710fac8c-da43-4934-87a9-212e248051da"
+  jurisdiction: "ed51dfc9-a724-4dee-9c79-39629129c1f0"
+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"
+---
+
+# Ted Neitzke IV
+
+Current Mayor, Port Washington, WI.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).