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/wa/counties/skagit/index.md

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

data/jurisdictions/us/states/wa/counties/skagit/municipalities/anacortes/people/matt-miller.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Matt Miller"
+description: "Mayor, Anacortes, WA"
+role: "Mayor, Anacortes, WA"
+level: "municipal"
+branch: "executive"
+state: "WA"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "229ac937-95a6-4d23-b832-8fd9bd6d56af"
+  office: "551d728b-3ede-4f82-8f25-bab8de86632a"
+  tenure: "e9264eb3-a73f-4a59-a7ea-a01bf6d94051"
+  jurisdiction: "158631b4-9459-4b7a-9849-1f2f3de7cd7b"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, wa]
+timestamp: "2026-07-04"
+---
+
+# Matt Miller
+
+Current Mayor, Anacortes, WA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/wa/counties/skagit/municipalities/mount-vernon/people/peter-donovan.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Peter Donovan"
+description: "Mayor, Mount Vernon, WA"
+role: "Mayor, Mount Vernon, WA"
+level: "municipal"
+branch: "executive"
+state: "WA"
+tenure:
+  start: "2024-01-01"
+  current: true
+ids:
+  person: "e1faa1b5-63c1-4672-a994-f5fdbc55008f"
+  office: "7034458a-3824-414e-a395-dc9395f058df"
+  tenure: "3b81d265-97c5-47f7-8368-b8ed571d24ad"
+  jurisdiction: "a439bde3-d9f1-4688-8be5-aec1cdd56490"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, wa]
+timestamp: "2026-07-04"
+---
+
+# Peter Donovan
+
+Current Mayor, Mount Vernon, WA.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).