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/nc/counties/cabarrus/index.md

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

data/jurisdictions/us/states/nc/counties/cabarrus/municipalities/concord/people/william-c-bill-dusch.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "William C. \"Bill\" Dusch"
+description: "Mayor, Concord, NC"
+role: "Mayor, Concord, NC"
+level: "municipal"
+branch: "executive"
+state: "NC"
+tenure:
+  start: "2017-01-01"
+  current: true
+ids:
+  person: "0dd5c2a2-af6d-4863-9dd8-fc4031f99095"
+  office: "e44c40c9-1312-4644-a62a-c4ea67ffedf5"
+  tenure: "94525924-d5f1-45d7-ad12-2a656aaa87b2"
+  jurisdiction: "ca280b71-299d-498d-ab17-9f3e9113fa33"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, nc]
+timestamp: "2026-07-04"
+---
+
+# William C. "Bill" Dusch
+
+Current Mayor, Concord, NC.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/nc/counties/cabarrus/municipalities/kannapolis/people/m-darrell-hinnant.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "M. Darrell Hinnant"
+description: "Mayor, Kannapolis, NC"
+role: "Mayor, Kannapolis, NC"
+level: "municipal"
+branch: "executive"
+state: "NC"
+tenure:
+  start: "2001-01-01"
+  current: true
+ids:
+  person: "b894a04e-90d5-4a46-ae62-afd95dd8650d"
+  office: "1d50c17c-d148-42c6-b7b1-007fbe053ee7"
+  tenure: "5fe9ebc3-e37b-4a8a-95d3-aab46fe73084"
+  jurisdiction: "2c084e6b-2ae2-48b0-8792-7eaff4954347"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, nc]
+timestamp: "2026-07-04"
+---
+
+# M. Darrell Hinnant
+
+Current Mayor, Kannapolis, NC.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).