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/tn/counties/bradley/index.md

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

data/jurisdictions/us/states/tn/counties/bradley/municipalities/charleston/people/donna-mcdermott.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Donna McDermott"
+description: "Mayor, Charleston, TN"
+role: "Mayor, Charleston, TN"
+level: "municipal"
+branch: "executive"
+state: "TN"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "ecb780d9-4951-4fb0-8cf4-46147bda9090"
+  office: "250059c2-0c69-4c8e-aa7e-ad375e9b1a1a"
+  tenure: "9eb1b5f1-f69c-4ab3-98e8-ba5cfda61e43"
+  jurisdiction: "393ec142-a499-45fe-b49e-22bef806268f"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, tn]
+timestamp: "2026-07-04"
+---
+
+# Donna McDermott
+
+Current Mayor, Charleston, TN.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/tn/counties/bradley/municipalities/cleveland/people/kevin-brooks.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Kevin Brooks"
+description: "Mayor, Cleveland, TN"
+role: "Mayor, Cleveland, TN"
+level: "municipal"
+branch: "executive"
+state: "TN"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "76347363-d8aa-467e-a9a1-a16691e6fef4"
+  office: "4d7e9fe5-3602-46f8-b262-98d33732d3cf"
+  tenure: "6256bc61-a4ca-4d72-81ce-fb7eb09732af"
+  jurisdiction: "73b12879-118a-4554-9ce8-cbad9ef50fcd"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, tn]
+timestamp: "2026-07-04"
+---
+
+# Kevin Brooks
+
+Current Mayor, Cleveland, TN.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).