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/sandusky/index.md

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

data/jurisdictions/us/states/oh/counties/sandusky/municipalities/clyde/people/doug-mccauley.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Doug McCauley"
+description: "Mayor, Clyde, OH"
+role: "Mayor, Clyde, OH"
+level: "municipal"
+branch: "executive"
+state: "OH"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "356d3d67-35c1-417f-9a21-f2e85df285c4"
+  office: "6ca6c70d-66d3-468c-8826-1f81163164eb"
+  tenure: "da803d61-aede-4390-af85-44db451c2fab"
+  jurisdiction: "14f4126a-df73-4687-b45e-30fe0046294a"
+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"
+---
+
+# Doug McCauley
+
+Current Mayor, Clyde, 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/sandusky/municipalities/fremont/people/danny-sanchez.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Danny Sanchez"
+description: "Mayor, Fremont, OH"
+role: "Mayor, Fremont, OH"
+level: "municipal"
+branch: "executive"
+state: "OH"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "ed1c9422-f95c-4a12-b48e-2b93a93f26f3"
+  office: "cf9276d7-2cdc-407b-a176-1c2f04fea41d"
+  tenure: "1a15f169-0a5f-4b70-8f3f-659df56ae0f1"
+  jurisdiction: "7d78f7be-b1da-4992-84b0-44ae5f6c91d0"
+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"
+---
+
+# Danny Sanchez
+
+Current Mayor, Fremont, OH.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).