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/de/counties/new-castle/index.md

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

data/jurisdictions/us/states/de/counties/new-castle/municipalities/new-castle/people/valarie-leary.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Valarie Leary"
+description: "Mayor, New Castle, DE"
+role: "Mayor, New Castle, DE"
+level: "municipal"
+branch: "executive"
+state: "DE"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "9bf3de95-4212-4a34-a06c-edbffdf3e915"
+  office: "aac63210-b550-442b-bad8-63a9257674a9"
+  tenure: "5f219af5-6589-4fae-a27d-98bc0670f955"
+  jurisdiction: "849997a0-2300-406d-a9ca-c644afbaa8e3"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, de]
+timestamp: "2026-07-04"
+---
+
+# Valarie Leary
+
+Current Mayor, New Castle, DE.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/de/counties/new-castle/municipalities/newark/people/jerry-clifton.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Jerry Clifton"
+description: "Mayor, Newark, DE"
+role: "Mayor, Newark, DE"
+level: "municipal"
+branch: "executive"
+state: "DE"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "b1b0a0c5-392f-46fb-9bac-28035e9aff9b"
+  office: "ad811de8-88ed-4f70-bfed-ffe0dfc083c5"
+  tenure: "d0c7661a-050a-45cc-990b-b4930fe35f19"
+  jurisdiction: "e2b2bd68-544d-4f63-8daf-b6919d9b08fe"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, de]
+timestamp: "2026-07-04"
+---
+
+# Jerry Clifton
+
+Current Mayor, Newark, DE.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/de/counties/new-castle/municipalities/wilmington/people/mike-purzycki.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Mike Purzycki"
+description: "Mayor, Wilmington, DE"
+role: "Mayor, Wilmington, DE"
+level: "municipal"
+branch: "executive"
+state: "DE"
+tenure:
+  start: "2017-01-03"
+  current: true
+ids:
+  person: "4ecfda04-d3c5-41e2-bd24-b0f3221c737e"
+  office: "a8df0b93-ed2c-4cf4-9d7a-0a3924126040"
+  tenure: "935297a6-4cce-47dc-8b24-7bc48af5d113"
+  jurisdiction: "1573f09f-7872-4ea5-81c9-59cd61e8ae21"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, de]
+timestamp: "2026-07-04"
+---
+
+# Mike Purzycki
+
+Current Mayor, Wilmington, DE.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).