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/or/counties/douglas/index.md

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

data/jurisdictions/us/states/or/counties/douglas/municipalities/roseburg/people/larry-rich.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Larry Rich"
+description: "Mayor, Roseburg, OR"
+role: "Mayor, Roseburg, OR"
+level: "municipal"
+branch: "executive"
+state: "OR"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "cbba4dfc-5ddf-4418-819b-1f3f844304c9"
+  office: "cc4e7914-1fe6-44d1-920d-1691a5a1b631"
+  tenure: "2c55cedf-a749-4044-bc14-9bb0139c17b2"
+  jurisdiction: "427f589a-7be9-4d00-9cda-009df848ecf3"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, or]
+timestamp: "2026-07-04"
+---
+
+# Larry Rich
+
+Current Mayor, Roseburg, OR.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/or/counties/douglas/municipalities/sutherlin/people/michelle-sumner.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Michelle Sumner"
+description: "Mayor, Sutherlin, OR"
+role: "Mayor, Sutherlin, OR"
+level: "municipal"
+branch: "executive"
+state: "OR"
+tenure:
+  start: "2018-12-01"
+  current: true
+ids:
+  person: "23185e38-a9f8-4604-a447-171dc3711ce3"
+  office: "1346123b-49e3-4d86-bef7-cb86460997ef"
+  tenure: "b3459945-16ce-48a2-a226-fb04b4b6d051"
+  jurisdiction: "2519f63f-cb68-47f7-842a-ce152f15373d"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, or]
+timestamp: "2026-07-04"
+---
+
+# Michelle Sumner
+
+Current Mayor, Sutherlin, OR.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).