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/wi/counties/wood/index.md

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

data/jurisdictions/us/states/wi/counties/wood/municipalities/marshfield/people/lois-testrake.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Lois TeStrake"
+description: "Mayor, Marshfield, WI"
+role: "Mayor, Marshfield, WI"
+level: "municipal"
+branch: "executive"
+state: "WI"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "7eb2f52e-4325-4de1-b1ba-2782aad5d84a"
+  office: "d2e44dfb-9120-4bba-a29e-be1420e6ff27"
+  tenure: "0d8e9a5b-e38c-4345-8abb-29244205d4b1"
+  jurisdiction: "c214f688-5613-4d94-9f48-24b83bbfd854"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, wi]
+timestamp: "2026-07-04"
+---
+
+# Lois TeStrake
+
+Current Mayor, Marshfield, WI.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/wi/counties/wood/municipalities/wisconsin-rapids/people/matt-zacher.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Matt Zacher"
+description: "Mayor, Wisconsin Rapids, WI"
+role: "Mayor, Wisconsin Rapids, WI"
+level: "municipal"
+branch: "executive"
+state: "WI"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "e9238197-4299-4144-a959-5b8ee6db7ae0"
+  office: "97c35c1f-9047-4c8c-85e0-842fef3dd1d2"
+  tenure: "2f99d5cc-9578-4a74-8ddd-9733e8fd96d7"
+  jurisdiction: "0c1db16a-bee2-42c6-bc9b-2fb4fd57b349"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, wi]
+timestamp: "2026-07-04"
+---
+
+# Matt Zacher
+
+Current Mayor, Wisconsin Rapids, WI.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).