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/washoe/index.md

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

data/jurisdictions/us/states/nv/counties/washoe/municipalities/reno/people/hillary-schieve.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Hillary Schieve"
+description: "Mayor, Reno, NV"
+role: "Mayor, Reno, NV"
+level: "municipal"
+branch: "executive"
+state: "NV"
+tenure:
+  start: "2014-11-12"
+  current: true
+ids:
+  person: "5f0a6893-928b-4714-9153-8f23ab1eaf92"
+  office: "5ef7b32a-f761-4abf-b0a6-e1fc24e4b1be"
+  tenure: "3f8be0b9-9146-4f14-9912-49ed17645721"
+  jurisdiction: "0666dc7e-0220-4212-ba80-ce941cff5694"
+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"
+---
+
+# Hillary Schieve
+
+Current Mayor, Reno, 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/washoe/municipalities/sparks/people/ed-lawson.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Ed Lawson"
+description: "Mayor, Sparks, NV"
+role: "Mayor, Sparks, NV"
+level: "municipal"
+branch: "executive"
+state: "NV"
+tenure:
+  start: "2020-09-14"
+  current: true
+ids:
+  person: "b535b89f-dbf2-47b6-8710-a0e28078f5a5"
+  office: "90b39418-f7b9-402d-8c90-ccaf03892507"
+  tenure: "f3e632e6-963b-493e-a4b8-759eea7f3d14"
+  jurisdiction: "ccc52e9f-88aa-4d35-8708-5f669e0258b3"
+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"
+---
+
+# Ed Lawson
+
+Current Mayor, Sparks, NV.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).