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/lee/index.md

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

data/jurisdictions/us/states/al/counties/lee/municipalities/auburn/people/ron-anders-jr.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Ron Anders, Jr."
+description: "Mayor, Auburn, AL"
+role: "Mayor, Auburn, AL"
+level: "municipal"
+branch: "executive"
+state: "AL"
+tenure:
+  start: "2018-11-05"
+  current: true
+ids:
+  person: "27b914b6-6a07-40da-8a69-9f6a7dd88c54"
+  office: "edb7273d-3c88-4367-8d95-229a8d6b6b19"
+  tenure: "8f687daf-fe40-46b2-80a5-b8c7ef1426e8"
+  jurisdiction: "b1f384ed-9cae-4038-ad82-b30a4ed954d8"
+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"
+---
+
+# Ron Anders, Jr.
+
+Current Mayor, Auburn, 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/lee/municipalities/opelika/people/gary-fuller.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Gary Fuller"
+description: "Mayor, Opelika, AL"
+role: "Mayor, Opelika, AL"
+level: "municipal"
+branch: "executive"
+state: "AL"
+tenure:
+  start: "2004-10-04"
+  current: true
+ids:
+  person: "2fb79761-90a9-4b8b-bfcb-e2cc038a0e33"
+  office: "c8c32243-1eac-496c-aea2-4b62ff85e956"
+  tenure: "7790b85b-14c8-4713-aa9c-599738a1d760"
+  jurisdiction: "b46d18d0-607a-4ab2-aedb-b999f7626abd"
+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"
+---
+
+# Gary Fuller
+
+Current Mayor, Opelika, AL.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).