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/dickinson/municipalities/okoboji/people/mary-vanderwoude.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Mary VanderWoude"
+description: "Mayor, Okoboji, IA"
+role: "Mayor, Okoboji, IA"
+level: "municipal"
+branch: "executive"
+state: "IA"
+tenure:
+  start: "2005-11-08"
+  current: true
+ids:
+  person: "d9de471b-a09f-40a0-aaed-3a7f9e1c7fad"
+  office: "914a54db-ccd8-4352-b532-0adf09e3e307"
+  tenure: "8f46b66f-740f-4507-9a56-83499423d1b6"
+  jurisdiction: "10c766f8-22f3-49df-9f31-4401a7e19851"
+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"
+---
+
+# Mary VanderWoude
+
+Current Mayor, Okoboji, IA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).