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/harrison/index.md

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

data/jurisdictions/us/states/ms/counties/harrison/municipalities/biloxi/people/andrew-gilich.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Andrew Gilich"
+description: "Mayor, Biloxi, MS"
+role: "Mayor, Biloxi, MS"
+level: "municipal"
+branch: "executive"
+state: "MS"
+tenure:
+  start: "2015-05-01"
+  current: true
+ids:
+  person: "80129ce3-9221-4438-9405-6d54cb0fbe06"
+  office: "f7daaff6-9976-45de-9089-800477d5e7ac"
+  tenure: "231afdf1-5982-4966-82a6-b69afaa5a9ce"
+  jurisdiction: "e74ea6db-5770-4da8-aee7-82678465751f"
+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"
+---
+
+# Andrew Gilich
+
+Current Mayor, Biloxi, 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/harrison/municipalities/gulfport/people/william-gardner-hewes.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "William Gardner Hewes"
+description: "Mayor, Gulfport, MS"
+role: "Mayor, Gulfport, MS"
+level: "municipal"
+branch: "executive"
+state: "MS"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "23abe70d-eec2-4e0f-8f9c-10a858abc05f"
+  office: "718def1f-94c8-42e3-b899-e141f5f1bd18"
+  tenure: "963f55d3-dfb5-44d0-af01-699c7db43f29"
+  jurisdiction: "bb908e95-caeb-41e5-81f9-f1fa35801f87"
+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 Gardner Hewes
+
+Current Mayor, Gulfport, 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/harrison/municipalities/long-beach/people/george-l-bass.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "George L. Bass"
+description: "Mayor, Long Beach, MS"
+role: "Mayor, Long Beach, MS"
+level: "municipal"
+branch: "executive"
+state: "MS"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "18eaf1bd-7565-49a2-a344-043629272a1a"
+  office: "a77b9be3-d20c-45f2-b4f7-05d5945245c0"
+  tenure: "1a572235-c9a2-4d4c-b96e-2fde6405954f"
+  jurisdiction: "8ba8f935-5399-46d9-813c-62d0fe939ff1"
+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"
+---
+
+# George L. Bass
+
+Current Mayor, Long Beach, MS.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).