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/oh/counties/trumbull/index.md

@@ -32,7 +32,7 @@ timestamp: "2026-07-03"
 
 # Trumbull County, OH
 
-County jurisdiction.
+County jurisdiction — 3 officeholders mapped.
 
 ## Demographics (ACS 2023)
 

data/jurisdictions/us/states/oh/counties/trumbull/municipalities/newton-falls/people/david-hanson.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "David Hanson"
+description: "Mayor, Newton Falls, OH"
+role: "Mayor, Newton Falls, OH"
+level: "municipal"
+branch: "executive"
+state: "OH"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "462ee925-0dc6-4cea-b801-be987b8aad16"
+  office: "9ed8bdbb-e05b-42a9-ab3a-069831ea94a7"
+  tenure: "7f9a5ec4-cbe4-418f-81a0-9f929133c401"
+  jurisdiction: "d5548255-9b0a-4b18-b7e0-8b1a4ca4a3bf"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, oh]
+timestamp: "2026-07-04"
+---
+
+# David Hanson
+
+Current Mayor, Newton Falls, OH.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/oh/counties/trumbull/municipalities/niles/people/steven-mientkiewicz.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Steven Mientkiewicz"
+description: "Mayor, Niles, OH"
+role: "Mayor, Niles, OH"
+level: "municipal"
+branch: "executive"
+state: "OH"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "617e286f-a336-43c1-a0d3-0c19d733d140"
+  office: "de6582f0-c7b8-4d3c-be44-f0edd974583c"
+  tenure: "cc92851a-70c6-4df9-9ca1-0ca938e7677d"
+  jurisdiction: "e5a1604f-d6fe-4e87-951b-ac15becf454d"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, oh]
+timestamp: "2026-07-04"
+---
+
+# Steven Mientkiewicz
+
+Current Mayor, Niles, OH.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/oh/counties/trumbull/municipalities/warren/people/william-franklin.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "William Franklin"
+description: "Mayor, Warren, OH"
+role: "Mayor, Warren, OH"
+level: "municipal"
+branch: "executive"
+state: "OH"
+tenure:
+  start: "2011-05-01"
+  current: true
+ids:
+  person: "7dc793c9-9131-41c1-919e-e4f517003013"
+  office: "205e58be-8aeb-43ee-95a9-555d077b5e45"
+  tenure: "6640f4d1-8fad-47ad-983f-864e89ae398d"
+  jurisdiction: "7f5e3395-4263-4679-9aa2-c6c4b83d9273"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, oh]
+timestamp: "2026-07-04"
+---
+
+# William Franklin
+
+Current Mayor, Warren, OH.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).