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/shelby/index.md

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

data/jurisdictions/us/states/tn/counties/shelby/municipalities/bartlett/people/david-parsons.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "David Parsons"
+description: "Mayor, Bartlett, TN"
+role: "Mayor, Bartlett, TN"
+level: "municipal"
+branch: "executive"
+state: "TN"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "92df1c6c-68a7-4fb5-9211-7777dc304072"
+  office: "551ac842-145b-4405-9861-9938bbd098e5"
+  tenure: "8dac697b-a2aa-419b-a520-843e79dbc379"
+  jurisdiction: "8bcac72f-8f61-41a2-8ed8-59047f5e1485"
+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"
+---
+
+# David Parsons
+
+Current Mayor, Bartlett, 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/shelby/municipalities/germantown/people/mike-palazzolo.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Mike Palazzolo"
+description: "Mayor, Germantown, TN"
+role: "Mayor, Germantown, TN"
+level: "municipal"
+branch: "executive"
+state: "TN"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "5c05445b-54f5-408e-9cbd-8792d63c7e66"
+  office: "8e34cc59-7042-4b33-908b-08b1b627002f"
+  tenure: "ef685789-f018-4af3-bbb5-ea5ddc362126"
+  jurisdiction: "03f67834-9d7c-4a30-8a61-bcbf32a7f6c7"
+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"
+---
+
+# Mike Palazzolo
+
+Current Mayor, Germantown, 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/shelby/municipalities/memphis/people/paul-young.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Paul Young"
+description: "Mayor, Memphis, TN"
+role: "Mayor, Memphis, TN"
+level: "municipal"
+branch: "executive"
+state: "TN"
+tenure:
+  start: "2024-01-01"
+  current: true
+ids:
+  person: "db3bca90-ef7e-4d71-80ae-be106d8b6d44"
+  office: "6e5c2326-7ed3-4bc3-a21c-6ba1f07b8284"
+  tenure: "914e6cdc-8fbd-4470-9acb-b23054b3f266"
+  jurisdiction: "879d72b4-ebcf-4de6-b9b7-b04d0bbb8c0c"
+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"
+---
+
+# Paul Young
+
+Current Mayor, Memphis, TN.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).