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/in/counties/marion/index.md

@@ -32,7 +32,7 @@ timestamp: "2026-07-03"
 
 # Marion County, IN
 
-County jurisdiction.
+County jurisdiction — 1 officeholders mapped.
 
 ## Demographics (ACS 2023)
 

data/jurisdictions/us/states/in/counties/marion/municipalities/indianapolis-city-balance/people/joe-hogsett.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Joe Hogsett"
+description: "Mayor, Indianapolis, IN — Indianapolis city (balance)"
+role: "Mayor, Indianapolis, IN"
+level: "municipal"
+branch: "executive"
+state: "IN"
+tenure:
+  start: "2016-01-01"
+  current: true
+ids:
+  person: "19d9afc3-5528-48a7-a513-04f65b0d43e4"
+  office: "8faf84a7-9c21-4ab6-a7cc-53d08867a78b"
+  tenure: "63b51331-da25-4b8f-8a5e-d4dc237dbb4b"
+  jurisdiction: "651017fd-710d-4061-ad4f-16f8d836f352"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, in]
+timestamp: "2026-07-04"
+---
+
+# Joe Hogsett
+
+Current Mayor, Indianapolis, IN (Indianapolis city (balance)).
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).