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/tx/counties/gregg/index.md

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

data/jurisdictions/us/states/tx/counties/gregg/municipalities/kilgore/people/ronnie-e-spradlin-iii.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Ronnie E. Spradlin III"
+description: "Mayor, Kilgore, TX"
+role: "Mayor, Kilgore, TX"
+level: "municipal"
+branch: "executive"
+state: "TX"
+tenure:
+  start: "2010-01-01"
+  current: true
+ids:
+  person: "eaa7c18e-1e0d-4862-96e9-10c2b73ed313"
+  office: "a7675497-1727-4a3d-83f3-68224e2d68bd"
+  tenure: "dbf78198-313b-43bb-a125-b260ef464fd9"
+  jurisdiction: "f6b76417-1f4b-43cd-b62a-f265dec9265d"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, tx]
+timestamp: "2026-07-04"
+---
+
+# Ronnie E. Spradlin III
+
+Current Mayor, Kilgore, TX.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/tx/counties/gregg/municipalities/longview/people/james-andrew-mack.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "James Andrew Mack"
+description: "Mayor, Longview, TX"
+role: "Mayor, Longview, TX"
+level: "municipal"
+branch: "executive"
+state: "TX"
+tenure:
+  start: "2015-05-01"
+  current: true
+ids:
+  person: "8bac540a-fca5-49e0-8636-9e524c369d21"
+  office: "5e0fa587-002f-478c-933d-5c5494e315db"
+  tenure: "c6d72727-1c42-412f-a557-ea5b7d6b2f5c"
+  jurisdiction: "89009ebd-2378-48f3-a7d3-43555ce0b1fc"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, tx]
+timestamp: "2026-07-04"
+---
+
+# James Andrew Mack
+
+Current Mayor, Longview, TX.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).