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/ca/counties/fresno/index.md

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

data/jurisdictions/us/states/ca/counties/fresno/municipalities/clovis/people/jose-flores.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Jose Flores"
+description: "Mayor, Clovis, CA"
+role: "Mayor, Clovis, CA"
+level: "municipal"
+branch: "executive"
+state: "CA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "7ff9fa2d-1d0a-439e-be52-537f45e67612"
+  office: "d104c38b-2d92-407a-839d-552e70b0e5f4"
+  tenure: "52b73c09-3ef3-4c47-8945-ee8f8a9affac"
+  jurisdiction: "8795ee25-d014-4b02-a2f4-df51867173c0"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, ca]
+timestamp: "2026-07-04"
+---
+
+# Jose Flores
+
+Current Mayor, Clovis, CA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/ca/counties/fresno/municipalities/fresno/people/jerry-dyer.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Jerry Dyer"
+description: "Mayor, Fresno, CA"
+role: "Mayor, Fresno, CA"
+level: "municipal"
+branch: "executive"
+state: "CA"
+tenure:
+  start: "2021-01-05"
+  current: true
+ids:
+  person: "4ffdafa6-6737-4544-9d88-d4a00dcb7751"
+  office: "a5b76579-f1d3-464c-ba99-a4fc13792a06"
+  tenure: "680f26eb-2b26-441e-9793-25fca720f376"
+  jurisdiction: "0f0877f4-493e-461d-a627-ca0464801ce0"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, ca]
+timestamp: "2026-07-04"
+---
+
+# Jerry Dyer
+
+Current Mayor, Fresno, CA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).