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/wa/counties/kittitas/index.md

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

data/jurisdictions/us/states/wa/counties/kittitas/municipalities/cle-elum/people/matthew-lundh.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Matthew Lundh"
+description: "Mayor, Cle Elum, WA"
+role: "Mayor, Cle Elum, WA"
+level: "municipal"
+branch: "executive"
+state: "WA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "05db229c-3541-4dbb-a52a-0811d1bf575d"
+  office: "42ab850d-4dc6-40f8-b63e-bce511538374"
+  tenure: "522ffaf9-ea5f-4b2a-a571-ba62e539d3d3"
+  jurisdiction: "c79d246d-997c-494a-8509-07b2b845744b"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, wa]
+timestamp: "2026-07-04"
+---
+
+# Matthew Lundh
+
+Current Mayor, Cle Elum, WA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/wa/counties/kittitas/municipalities/ellensburg/people/rich-elliott.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Rich Elliott"
+description: "Mayor, Ellensburg, WA"
+role: "Mayor, Ellensburg, WA"
+level: "municipal"
+branch: "executive"
+state: "WA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "893a95d8-834d-4abf-9062-b4f3a59d11ad"
+  office: "6a602d55-36f0-4455-8aa4-26067f7d5da2"
+  tenure: "d4e78171-923d-40bf-a7c4-59e45354ea64"
+  jurisdiction: "46664ffe-8868-4a8f-9f7b-9f4af91eb875"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, wa]
+timestamp: "2026-07-04"
+---
+
+# Rich Elliott
+
+Current Mayor, Ellensburg, WA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).