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/ut/counties/emery/index.md

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

data/jurisdictions/us/states/ut/counties/emery/municipalities/green-river/people/ren-hatt.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Ren Hatt"
+description: "Mayor, Green River, UT"
+role: "Mayor, Green River, UT"
+level: "municipal"
+branch: "executive"
+state: "UT"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "60fba46d-8df8-44d1-afa0-9179431b3599"
+  office: "ba57266d-696d-4328-a2dd-f2c3df08860a"
+  tenure: "d132114e-c975-4fb7-b480-24b06141cc4d"
+  jurisdiction: "09cf3fd5-3a54-4251-92c3-9e1925c8bb1f"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, ut]
+timestamp: "2026-07-04"
+---
+
+# Ren Hatt
+
+Current Mayor, Green River, UT.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/ut/counties/emery/municipalities/orangeville/people/david-robertson.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "David Robertson"
+description: "Mayor, Orangeville, UT"
+role: "Mayor, Orangeville, UT"
+level: "municipal"
+branch: "executive"
+state: "UT"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "cbfd52a1-93cb-4a9c-be35-ad09ec085c11"
+  office: "6b869499-ea3b-4ca8-9c51-aa5eb38aa5a3"
+  tenure: "eb383878-3241-44c3-9772-455e7f020d12"
+  jurisdiction: "88dd1035-f635-4fa0-afd6-0aa5585a3938"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, ut]
+timestamp: "2026-07-04"
+---
+
+# David Robertson
+
+Current Mayor, Orangeville, UT.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).