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/cache/index.md

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

data/jurisdictions/us/states/ut/counties/cache/municipalities/logan/people/holly-h-daines.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Holly H. Daines"
+description: "Mayor, Logan, UT"
+role: "Mayor, Logan, UT"
+level: "municipal"
+branch: "executive"
+state: "UT"
+tenure:
+  start: "2017-11-01"
+  current: true
+ids:
+  person: "977052cc-d893-4412-865a-c709f6dcf94b"
+  office: "fcdbd575-aa6c-46ab-948b-6c1cd6e6dc6d"
+  tenure: "57bd9159-081b-40ad-a661-1a4dfafcc2ad"
+  jurisdiction: "0d609a90-a568-4e92-b745-28192bab2b2f"
+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"
+---
+
+# Holly H. Daines
+
+Current Mayor, Logan, 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/cache/municipalities/nibley/people/larry-jacobsen.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Larry Jacobsen"
+description: "Mayor, Nibley, UT"
+role: "Mayor, Nibley, UT"
+level: "municipal"
+branch: "executive"
+state: "UT"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "f6f6a99e-7c76-4889-b10e-4b2e8b8aa074"
+  office: "dd969a23-38f8-4fe2-acb4-e92a0ddee425"
+  tenure: "1d5c98ac-7821-406f-ba0f-f456c33be8c3"
+  jurisdiction: "2eb8b1e8-fcfe-4807-bb47-56d4ee138755"
+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"
+---
+
+# Larry Jacobsen
+
+Current Mayor, Nibley, UT.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).