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/mi/counties/macomb/index.md

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

data/jurisdictions/us/states/mi/counties/macomb/municipalities/sterling-heights/people/michael-c-taylor.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Michael C. Taylor"
+description: "Mayor, Sterling Heights, MI"
+role: "Mayor, Sterling Heights, MI"
+level: "municipal"
+branch: "executive"
+state: "MI"
+tenure:
+  start: "2014-12-01"
+  current: true
+ids:
+  person: "04531a6c-b9c2-4d45-9d25-27b0c3d7e4d7"
+  office: "794c9bd8-6be2-4b6f-bdf4-98831453a064"
+  tenure: "10c6993d-e72c-41eb-9d40-bd5b8ca0d3ab"
+  jurisdiction: "95f8cdfe-a7c2-4e2c-b596-9d7e40bcc98d"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, mi]
+timestamp: "2026-07-04"
+---
+
+# Michael C. Taylor
+
+Current Mayor, Sterling Heights, MI.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/mi/counties/macomb/municipalities/warren/people/james-r-fouts.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "James R. Fouts"
+description: "Mayor, Warren, MI"
+role: "Mayor, Warren, MI"
+level: "municipal"
+branch: "executive"
+state: "MI"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "e431e079-6d25-4f94-a108-71a9143daca6"
+  office: "1d03237a-3702-484d-9b4c-b15f6c1cd2d4"
+  tenure: "c395c465-2ffc-4cff-b4a7-007cfa51b27f"
+  jurisdiction: "a886c6b1-0dcd-4fcb-af8b-40423a01d30b"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, mi]
+timestamp: "2026-07-04"
+---
+
+# James R. Fouts
+
+Current Mayor, Warren, MI.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).