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/madison/index.md

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

data/jurisdictions/us/states/ms/counties/madison/municipalities/canton/people/william-truly-jr.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "William Truly, Jr."
+description: "Mayor, Canton, MS"
+role: "Mayor, Canton, MS"
+level: "municipal"
+branch: "executive"
+state: "MS"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "442c1625-1e9d-4e1e-b86e-6e477c7d9a7e"
+  office: "0e38e430-bf40-4035-864f-674af164438f"
+  tenure: "f81a7905-62ad-4ad2-a6df-f1b664b1cf55"
+  jurisdiction: "0460ba22-b7e7-402c-bc57-94ef9387e90d"
+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"
+---
+
+# William Truly, Jr.
+
+Current Mayor, Canton, 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/madison/municipalities/madison/people/mary-hawkins-butler.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Mary Hawkins Butler"
+description: "Mayor, Madison, MS"
+role: "Mayor, Madison, MS"
+level: "municipal"
+branch: "executive"
+state: "MS"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "94a0dba3-4340-481f-8406-d196f2f280f0"
+  office: "528f9a9b-a593-4221-8d2b-08c378b32577"
+  tenure: "8c506415-1359-4449-8cd1-a604f2565423"
+  jurisdiction: "b1a36c95-877d-4be4-bea9-e1d398d688d6"
+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"
+---
+
+# Mary Hawkins Butler
+
+Current Mayor, Madison, 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/madison/municipalities/ridgeland/people/gene-f-mcgee.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Gene F. McGee"
+description: "Mayor, Ridgeland, MS"
+role: "Mayor, Ridgeland, MS"
+level: "municipal"
+branch: "executive"
+state: "MS"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "a8c42f61-6ba0-4853-82d3-26ca6c5b959b"
+  office: "cf9d411e-8837-42d3-84b7-19b265c14539"
+  tenure: "33a93a17-2e12-414a-b166-0e576ce403e9"
+  jurisdiction: "b2996935-0240-4019-926c-5b71a1fa378d"
+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"
+---
+
+# Gene F. McGee
+
+Current Mayor, Ridgeland, MS.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).