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/ga/counties/henry/index.md

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

data/jurisdictions/us/states/ga/counties/henry/municipalities/mcdonough/people/sandra-vincent.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Sandra Vincent"
+description: "Mayor, McDonough, GA"
+role: "Mayor, McDonough, GA"
+level: "municipal"
+branch: "executive"
+state: "GA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "c8cccc47-a272-43ed-b265-19f8eb488002"
+  office: "89c11df8-a6f3-40b7-9ce2-cf8c7994c271"
+  tenure: "f76f4dee-22a6-4c7f-a725-90ce24cee4f1"
+  jurisdiction: "3302b9a6-630f-46cd-a219-794a5472f0c3"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, ga]
+timestamp: "2026-07-04"
+---
+
+# Sandra Vincent
+
+Current Mayor, McDonough, GA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/ga/counties/henry/municipalities/stockbridge/people/anthony-s-ford.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Anthony S. Ford"
+description: "Mayor, Stockbridge, GA"
+role: "Mayor, Stockbridge, GA"
+level: "municipal"
+branch: "executive"
+state: "GA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "47715fcd-fde7-4cf6-b36d-0a85b8dae8ef"
+  office: "dcdc1926-59ce-4c33-805f-38dc747c077c"
+  tenure: "cd85e727-8081-4a7f-a1ad-9dfb48c21226"
+  jurisdiction: "953c7728-4278-4818-bf7d-9801d5d081e1"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, ga]
+timestamp: "2026-07-04"
+---
+
+# Anthony S. Ford
+
+Current Mayor, Stockbridge, GA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).