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/vt/counties/washington/index.md

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

data/jurisdictions/us/states/vt/counties/washington/municipalities/barre/people/lucas-j-herring.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Lucas J. Herring"
+description: "Mayor, Barre, VT"
+role: "Mayor, Barre, VT"
+level: "municipal"
+branch: "executive"
+state: "VT"
+tenure:
+  start: "2018-01-01"
+  current: true
+ids:
+  person: "832903cf-af1f-4991-9d18-a15785b4198c"
+  office: "18fc98ba-7c52-4743-a74f-d6d38d036b98"
+  tenure: "6596e125-31db-46fa-a92f-ca228c8a089c"
+  jurisdiction: "600effc8-a031-4b3b-8d12-cd73abcd9da9"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, vt]
+timestamp: "2026-07-04"
+---
+
+# Lucas J. Herring
+
+Current Mayor, Barre, VT.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/vt/counties/washington/municipalities/montpelier/people/jack-mccullough.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Jack McCullough"
+description: "Mayor, Montpelier, VT"
+role: "Mayor, Montpelier, VT"
+level: "municipal"
+branch: "executive"
+state: "VT"
+tenure:
+  start: "2023-03-01"
+  current: true
+ids:
+  person: "62eea139-6c01-41b5-a53c-31fe51f27a74"
+  office: "264ccb58-e283-41da-b155-5614fe2efa17"
+  tenure: "71bd0bb6-8f1d-4303-9325-2e77b54b6d74"
+  jurisdiction: "ba703dec-f914-4717-b2b2-dcdf208c7e14"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, vt]
+timestamp: "2026-07-04"
+---
+
+# Jack McCullough
+
+Current Mayor, Montpelier, VT.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).