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/al/counties/tuscaloosa/index.md

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

data/jurisdictions/us/states/al/counties/tuscaloosa/municipalities/northport/people/john-hinton.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "John Hinton"
+description: "Mayor, Northport, AL"
+role: "Mayor, Northport, AL"
+level: "municipal"
+branch: "executive"
+state: "AL"
+tenure:
+  start: "2023-01-03"
+  current: true
+ids:
+  person: "ce67770b-a52d-443b-8b61-f15de78949d1"
+  office: "d9f83e2e-cc10-4619-925e-ae5ecf3cb4e6"
+  tenure: "8848147c-5559-47d8-b005-a0011c09fc5b"
+  jurisdiction: "97cd307a-002b-4f44-812f-cf4e0f378631"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, al]
+timestamp: "2026-07-04"
+---
+
+# John Hinton
+
+Current Mayor, Northport, AL.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/al/counties/tuscaloosa/municipalities/tuscaloosa/people/walter-maddox.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Walter Maddox"
+description: "Mayor, Tuscaloosa, AL"
+role: "Mayor, Tuscaloosa, AL"
+level: "municipal"
+branch: "executive"
+state: "AL"
+tenure:
+  start: "2021-05-17"
+  current: true
+ids:
+  person: "3196dfa8-db0c-4881-9a0f-72a48aa485b2"
+  office: "c5bd38f6-ddba-4d37-8811-20746c151cda"
+  tenure: "e6ebdc56-a036-4d7c-8a98-ed3c8cc43839"
+  jurisdiction: "a02b9ad6-00f1-4397-825f-0e6d910393fa"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, al]
+timestamp: "2026-07-04"
+---
+
+# Walter Maddox
+
+Current Mayor, Tuscaloosa, AL.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).