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/ms/counties/hinds/index.md

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

data/jurisdictions/us/states/ms/counties/hinds/municipalities/byram/people/richard-white.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Richard White"
+description: "Mayor, Byram, MS"
+role: "Mayor, Byram, MS"
+level: "municipal"
+branch: "executive"
+state: "MS"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "2a67f82b-ec81-44a5-965d-3259da36d7f2"
+  office: "ad29b2b4-e32f-412f-b78c-b84e3ee8cbac"
+  tenure: "7be18c41-b7dc-4cb2-a2d6-3c54cbd8eed1"
+  jurisdiction: "7da36067-6bbf-438f-9534-1349e9806cdf"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, ms]
+timestamp: "2026-07-04"
+---
+
+# Richard White
+
+Current Mayor, Byram, MS.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/ms/counties/hinds/municipalities/clinton/people/phil-fisher.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Phil Fisher"
+description: "Mayor, Clinton, MS"
+role: "Mayor, Clinton, MS"
+level: "municipal"
+branch: "executive"
+state: "MS"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "0b62da55-1159-45c8-9d50-f055a6b631fd"
+  office: "3f7546bf-170c-49e9-9cca-014f3113ce6d"
+  tenure: "d8c57919-71dc-450e-bf94-41ec6a511b4f"
+  jurisdiction: "d1f63d30-3692-4031-bbb2-188f6055f303"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, ms]
+timestamp: "2026-07-04"
+---
+
+# Phil Fisher
+
+Current Mayor, Clinton, MS.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/ms/counties/hinds/municipalities/jackson/people/chokwe-antar-lumumba.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Chokwe Antar Lumumba"
+description: "Mayor, Jackson, MS"
+role: "Mayor, Jackson, MS"
+level: "municipal"
+branch: "executive"
+state: "MS"
+tenure:
+  start: "2017-07-03"
+  current: true
+ids:
+  person: "4f791cfc-81e2-4e27-98be-44f5bfb0125e"
+  office: "f3c3ba90-887b-4d94-bd0c-09e0b4eb0c90"
+  tenure: "064bee63-635e-4654-8415-358935c9937b"
+  jurisdiction: "11dc7212-72a0-471b-b1ac-3569e382f8c7"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, ms]
+timestamp: "2026-07-04"
+---
+
+# Chokwe Antar Lumumba
+
+Current Mayor, Jackson, MS.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).