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/lewis/index.md

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

data/jurisdictions/us/states/wa/counties/lewis/municipalities/centralia/people/kelly-smith-johnston.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Kelly Smith Johnston"
+description: "Mayor, Centralia, WA"
+role: "Mayor, Centralia, WA"
+level: "municipal"
+branch: "executive"
+state: "WA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "439434eb-c6b4-48e4-b80c-0d5c6b5c493f"
+  office: "d0d147cb-8d4d-42f2-9f5b-8fc4ce325656"
+  tenure: "12396992-cca7-4337-9748-8f82e6f7623b"
+  jurisdiction: "d02da327-fe61-4316-a5e7-9a8c0809dcf9"
+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"
+---
+
+# Kelly Smith Johnston
+
+Current Mayor, Centralia, 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/lewis/municipalities/chehalis/people/tony-ketchum.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Tony Ketchum"
+description: "Mayor, Chehalis, WA"
+role: "Mayor, Chehalis, WA"
+level: "municipal"
+branch: "executive"
+state: "WA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "8d151f5a-f6f8-4dec-9a80-eb224968f518"
+  office: "f7c8898b-f297-4e31-9ed0-a8bc4180520c"
+  tenure: "563e8ddc-4951-4559-9501-b050c4a8b3fd"
+  jurisdiction: "42e14af4-b76c-4787-891c-4148c786e495"
+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"
+---
+
+# Tony Ketchum
+
+Current Mayor, Chehalis, WA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).