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/sc/counties/horry/index.md

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

data/jurisdictions/us/states/sc/counties/horry/municipalities/conway/people/barbara-blain-bellamy.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Barbara Blain-Bellamy"
+description: "Mayor, Conway, SC"
+role: "Mayor, Conway, SC"
+level: "municipal"
+branch: "executive"
+state: "SC"
+tenure:
+  start: "2016-01-04"
+  current: true
+ids:
+  person: "4caf6475-6043-42b5-a072-aeaf56bed88d"
+  office: "c4d47c24-67d9-4a29-94b1-138abbc3104b"
+  tenure: "7e2d0071-623e-463d-9771-c19a79b9e210"
+  jurisdiction: "54be84ee-5eb8-49d0-81df-a1af9080f673"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, sc]
+timestamp: "2026-07-04"
+---
+
+# Barbara Blain-Bellamy
+
+Current Mayor, Conway, SC.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/sc/counties/horry/municipalities/loris/people/michael-e-suggs.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Michael E. Suggs"
+description: "Mayor, Loris, SC"
+role: "Mayor, Loris, SC"
+level: "municipal"
+branch: "executive"
+state: "SC"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "e372f2d8-2c4a-4bfa-a1b2-d238e4bf59a5"
+  office: "e0df0110-48d3-4fc4-85d0-985aaa52512e"
+  tenure: "dab9cfd8-dd10-43af-9bde-63afb3778542"
+  jurisdiction: "96ee7822-82af-48fa-8d50-197f299a84f8"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, sc]
+timestamp: "2026-07-04"
+---
+
+# Michael E. Suggs
+
+Current Mayor, Loris, SC.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/sc/counties/horry/municipalities/myrtle-beach/people/john-rhodes.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "John Rhodes"
+description: "Mayor, Myrtle Beach, SC"
+role: "Mayor, Myrtle Beach, SC"
+level: "municipal"
+branch: "executive"
+state: "SC"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "85436ea1-d9e0-49db-8324-3090b020649b"
+  office: "7b72a870-98d2-4242-b71a-23df630209e4"
+  tenure: "5521c60b-9f59-4ed8-86fd-ad5e2c71f83b"
+  jurisdiction: "9c484dd7-1758-4986-88da-e75c626e6f5f"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, sc]
+timestamp: "2026-07-04"
+---
+
+# John Rhodes
+
+Current Mayor, Myrtle Beach, SC.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).