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/la/counties/rapides-parish/index.md

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

data/jurisdictions/us/states/la/counties/rapides-parish/municipalities/alexandria/people/jacques-roy.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Jacques Roy"
+description: "Mayor, Alexandria, LA"
+role: "Mayor, Alexandria, LA"
+level: "municipal"
+branch: "executive"
+state: "LA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "aa2a234b-0d56-49f2-ae2a-188d3b1a6f70"
+  office: "eccb6225-4941-490f-a840-7ef464f3ac1e"
+  tenure: "1f16e479-7c28-4b09-b9a3-71d4a1fe0d77"
+  jurisdiction: "86141914-1bc8-434d-91f1-ec033460087b"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, la]
+timestamp: "2026-07-04"
+---
+
+# Jacques Roy
+
+Current Mayor, Alexandria, LA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/la/counties/rapides-parish/municipalities/pineville/people/clarence-fields.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Clarence Fields"
+description: "Mayor, Pineville, LA"
+role: "Mayor, Pineville, LA"
+level: "municipal"
+branch: "executive"
+state: "LA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "49b77855-7914-4e0f-947a-64daebce0724"
+  office: "e67834e1-3e40-446d-aa83-bd56aeddacd3"
+  tenure: "eada6786-0886-4c69-81d5-68e3a2390a7d"
+  jurisdiction: "dba8e445-6ba3-4136-8a5b-a60a78503230"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, la]
+timestamp: "2026-07-04"
+---
+
+# Clarence Fields
+
+Current Mayor, Pineville, LA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).