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/delaware/index.md

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

data/jurisdictions/us/states/ia/counties/delaware/municipalities/edgewood/people/bruce-hemann.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Bruce Hemann"
+description: "Mayor, Edgewood, IA"
+role: "Mayor, Edgewood, IA"
+level: "municipal"
+branch: "executive"
+state: "IA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "2c01e18a-91c1-420b-b030-330f07c69074"
+  office: "24821e07-7388-44d5-9fb7-2cc0cd236d5d"
+  tenure: "4fd92170-7bdb-4f9b-a40b-65aa95f03223"
+  jurisdiction: "a958cdf5-180e-4ef8-8bba-e6b29b3a99b0"
+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"
+---
+
+# Bruce Hemann
+
+Current Mayor, Edgewood, IA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/ia/counties/delaware/municipalities/manchester/people/connie-l-behnken.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Connie L. Behnken"
+description: "Mayor, Manchester, IA"
+role: "Mayor, Manchester, IA"
+level: "municipal"
+branch: "executive"
+state: "IA"
+tenure:
+  start: "2021-11-01"
+  current: true
+ids:
+  person: "40478644-4710-4b33-bc32-619b62319c1c"
+  office: "a191097d-a054-4892-be72-7b0977b8ab3f"
+  tenure: "2b5ecdd3-683a-421b-95c8-12708e497596"
+  jurisdiction: "4ea01cbe-7878-4f36-97cc-61c8ccd3b517"
+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"
+---
+
+# Connie L. Behnken
+
+Current Mayor, Manchester, IA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).