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/nv/counties/clark/index.md

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

data/jurisdictions/us/states/nv/counties/clark/municipalities/henderson/people/michelle-romero.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Michelle Romero"
+description: "Mayor, Henderson, NV"
+role: "Mayor, Henderson, NV"
+level: "municipal"
+branch: "executive"
+state: "NV"
+tenure:
+  start: "2023-01-03"
+  current: true
+ids:
+  person: "a417c8fb-5681-44f7-8bcd-feb10766ff46"
+  office: "1fdacf24-eb32-4091-ab9c-1b79907f1830"
+  tenure: "08f469e5-617a-4149-8bb4-e6778867c464"
+  jurisdiction: "0e22877a-f143-484a-a856-dd099a3cdc52"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, nv]
+timestamp: "2026-07-04"
+---
+
+# Michelle Romero
+
+Current Mayor, Henderson, NV.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/nv/counties/clark/municipalities/las-vegas/people/carolyn-goodman.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Carolyn Goodman"
+description: "Mayor, Las Vegas, NV"
+role: "Mayor, Las Vegas, NV"
+level: "municipal"
+branch: "executive"
+state: "NV"
+tenure:
+  start: "2011-07-06"
+  current: true
+ids:
+  person: "5c11fa4d-ee8b-4fb1-af82-9dce81c0e7e3"
+  office: "f781eb79-3998-4882-bae5-c4422633cefb"
+  tenure: "c4c8e1dc-f679-4f29-9711-59782a169916"
+  jurisdiction: "3c232b3e-100d-483c-836f-97f7f9256f55"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, nv]
+timestamp: "2026-07-04"
+---
+
+# Carolyn Goodman
+
+Current Mayor, Las Vegas, NV.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/nv/counties/clark/municipalities/north-las-vegas/people/john-jay-lee.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "John Jay Lee"
+description: "Mayor, North Las Vegas, NV"
+role: "Mayor, North Las Vegas, NV"
+level: "municipal"
+branch: "executive"
+state: "NV"
+tenure:
+  start: "2013-07-01"
+  current: true
+ids:
+  person: "fa79fad9-051c-4e44-b333-7a20c9a35474"
+  office: "f91c5136-1f43-4772-a651-f8118ea08cd6"
+  tenure: "276ee198-12aa-4d03-ab2e-e170fbdccc87"
+  jurisdiction: "97fe6d91-cde6-4fef-9504-c48a96cca77f"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, nv]
+timestamp: "2026-07-04"
+---
+
+# John Jay Lee
+
+Current Mayor, North Las Vegas, NV.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).