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/ny/counties/dutchess/index.md

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

data/jurisdictions/us/states/ny/counties/dutchess/municipalities/beacon/people/lee-kyriacou.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Lee Kyriacou"
+description: "Mayor, Beacon, NY"
+role: "Mayor, Beacon, NY"
+level: "municipal"
+branch: "executive"
+state: "NY"
+tenure:
+  start: "2020-01-01"
+  current: true
+ids:
+  person: "dfd369ef-22c3-41b1-adf9-c483c6364f1b"
+  office: "5321874f-5ea8-405f-9570-e7a4f5e0aade"
+  tenure: "b9d0641f-2c4e-416e-813c-1ac427eca564"
+  jurisdiction: "d348b355-c085-4a9d-95a0-dce0d212b100"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, ny]
+timestamp: "2026-07-04"
+---
+
+# Lee Kyriacou
+
+Current Mayor, Beacon, NY.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/ny/counties/dutchess/municipalities/poughkeepsie/people/yvonne-flowers.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Yvonne Flowers"
+description: "Mayor, Poughkeepsie, NY"
+role: "Mayor, Poughkeepsie, NY"
+level: "municipal"
+branch: "executive"
+state: "NY"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "4f8118ff-8f8c-4493-8950-18969aabd390"
+  office: "5407db2e-5636-40ed-b724-d6743a1e901c"
+  tenure: "e3d5ff5d-54ed-4f88-9df6-96a982c45f9e"
+  jurisdiction: "0a266368-ea98-4e9d-b356-f58fa374aac4"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, ny]
+timestamp: "2026-07-04"
+---
+
+# Yvonne Flowers
+
+Current Mayor, Poughkeepsie, NY.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).