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/pa/counties/northampton/index.md

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

data/jurisdictions/us/states/pa/counties/northampton/municipalities/bethlehem/people/j-william-reynolds.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "J. William Reynolds"
+description: "Mayor, Bethlehem, PA"
+role: "Mayor, Bethlehem, PA"
+level: "municipal"
+branch: "executive"
+state: "PA"
+tenure:
+  start: "2021-01-01"
+  current: true
+ids:
+  person: "b9585799-7dc3-4655-8357-57d983cc35fa"
+  office: "942d0424-7cf4-4fdb-8b24-4fe53d4730f4"
+  tenure: "8ef678db-8f9d-41f1-9cdc-1fe9eec409f7"
+  jurisdiction: "e9e3794e-877b-4504-8c52-96b49d21e136"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, pa]
+timestamp: "2026-07-04"
+---
+
+# J. William Reynolds
+
+Current Mayor, Bethlehem, PA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/pa/counties/northampton/municipalities/easton/people/salvatore-j-panto-jr.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Salvatore J. Panto, Jr."
+description: "Mayor, Easton, PA"
+role: "Mayor, Easton, PA"
+level: "municipal"
+branch: "executive"
+state: "PA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "3765b4e7-49b8-4030-b608-0f4965afa36b"
+  office: "dff5dcaa-3ae5-44be-9ad2-9284d6e49fdb"
+  tenure: "2e0f8f1f-0ef1-4910-b7a4-9e6c9c6e0b11"
+  jurisdiction: "d149ff8c-88ff-4a16-8e6a-791b3e562423"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, pa]
+timestamp: "2026-07-04"
+---
+
+# Salvatore J. Panto, Jr.
+
+Current Mayor, Easton, PA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).