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/solano/index.md

@@ -32,7 +32,7 @@ timestamp: "2026-07-03"
 
 # Solano County, CA
 
-County jurisdiction.
+County jurisdiction — 3 officeholders mapped.
 
 ## Demographics (ACS 2023)
 

data/jurisdictions/us/states/ca/counties/solano/municipalities/fairfield/people/harry-t-price.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Harry T. Price"
+description: "Mayor, Fairfield, CA"
+role: "Mayor, Fairfield, CA"
+level: "municipal"
+branch: "executive"
+state: "CA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "f2e59308-8f49-4617-afce-fb74e109f46c"
+  office: "142324f8-4ccc-4467-aaf7-a935a97313bf"
+  tenure: "75e63fa1-056a-4f29-af40-40fc9ba130a6"
+  jurisdiction: "9abf159f-b7ac-424d-b8f3-939aa8476721"
+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"
+---
+
+# Harry T. Price
+
+Current Mayor, Fairfield, 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/solano/municipalities/vacaville/people/ron-rowlett.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Ron Rowlett"
+description: "Mayor, Vacaville, CA"
+role: "Mayor, Vacaville, CA"
+level: "municipal"
+branch: "executive"
+state: "CA"
+tenure:
+  start: "2018-11-01"
+  current: true
+ids:
+  person: "4a55407b-1d82-4574-837d-ea1c40bb10ad"
+  office: "3f5a38c3-9999-4ac3-97a0-3406f4c9257b"
+  tenure: "b66b7e53-fdc0-4fd0-80f7-7c5a4f1bcd0d"
+  jurisdiction: "31888bbe-81b3-4edc-af1e-72bcf9bbdf76"
+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"
+---
+
+# Ron Rowlett
+
+Current Mayor, Vacaville, 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/solano/municipalities/vallejo/people/robert-h-mcconnell.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Robert H. McConnell"
+description: "Mayor, Vallejo, CA"
+role: "Mayor, Vallejo, CA"
+level: "municipal"
+branch: "executive"
+state: "CA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "b1d4b004-1256-4714-b4a9-a2b775921cf6"
+  office: "88c60882-5ae0-49c7-8edf-4cafc514457d"
+  tenure: "e12f53b5-d0a7-4b58-89d4-edb0039946ec"
+  jurisdiction: "5541ad4a-22e8-4763-9adf-5a47d8c1e540"
+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"
+---
+
+# Robert H. McConnell
+
+Current Mayor, Vallejo, CA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).