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/bastrop/index.md

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

data/jurisdictions/us/states/tx/counties/bastrop/municipalities/bastrop/people/lyle-nelson.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Lyle Nelson"
+description: "Mayor, Bastrop, TX"
+role: "Mayor, Bastrop, TX"
+level: "municipal"
+branch: "executive"
+state: "TX"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "8fdb92b5-76c5-48c2-987e-dc5fa70eb360"
+  office: "cd5286f2-55d3-48e6-b870-dffe5149cba1"
+  tenure: "5bf032c4-e39c-4601-b5b1-d1eccc9a57ff"
+  jurisdiction: "dd00bdbf-e9b2-4e7c-92f8-2ab4e3dd6ec7"
+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"
+---
+
+# Lyle Nelson
+
+Current Mayor, Bastrop, 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/bastrop/municipalities/elgin/people/theresa-mcshan.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Theresa McShan"
+description: "Mayor, Elgin, TX"
+role: "Mayor, Elgin, TX"
+level: "municipal"
+branch: "executive"
+state: "TX"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "2be19f9f-c558-4d3c-8e85-a2caf2fb1209"
+  office: "dc941fde-2d73-4df9-a7cc-2a2ce7f12591"
+  tenure: "0046392c-856b-47c4-af0a-73e86df0c720"
+  jurisdiction: "89eee7a5-9ba9-407b-9aac-34d1354edaaa"
+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"
+---
+
+# Theresa McShan
+
+Current Mayor, Elgin, TX.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).