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/anderson/index.md

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

data/jurisdictions/us/states/tn/counties/anderson/municipalities/clinton/people/scott-burton.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Scott Burton"
+description: "Mayor, Clinton, TN"
+role: "Mayor, Clinton, TN"
+level: "municipal"
+branch: "executive"
+state: "TN"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "eaad29bb-a917-4e8c-95d4-f2af88b2c12e"
+  office: "25d98046-d4d5-43d7-b89e-ca5261eb3709"
+  tenure: "4e7511c0-7a0a-4dae-9814-42cc397bc858"
+  jurisdiction: "66a529de-d515-44a4-bb44-986ed9313729"
+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"
+---
+
+# Scott Burton
+
+Current Mayor, Clinton, 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/anderson/municipalities/rocky-top/people/kerry-templin.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Kerry Templin"
+description: "Mayor, Rocky Top, TN"
+role: "Mayor, Rocky Top, TN"
+level: "municipal"
+branch: "executive"
+state: "TN"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "bc6a5b8a-80a7-44c9-b703-70f023e5cc9b"
+  office: "46f9a191-6eb7-4578-8965-28a0b18e7e97"
+  tenure: "18634068-4ee2-4350-a89b-496e0fc82a24"
+  jurisdiction: "b18d71c9-23cc-4fca-a1d9-9bd664c3ec1c"
+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"
+---
+
+# Kerry Templin
+
+Current Mayor, Rocky Top, TN.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).