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/al/counties/marshall/index.md

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

data/jurisdictions/us/states/al/counties/marshall/municipalities/albertville/people/tracy-honea.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Tracy Honea"
+description: "Mayor, Albertville, AL"
+role: "Mayor, Albertville, AL"
+level: "municipal"
+branch: "executive"
+state: "AL"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "44e6a59b-d2e3-4c4d-a2d5-1660947d920f"
+  office: "f4504bd4-ac05-4e87-9f20-6ec53aa98553"
+  tenure: "b249b6c6-6e4d-4e56-885a-0b005566230f"
+  jurisdiction: "c8bad17a-1ee6-463a-9230-9462c949f7a9"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, al]
+timestamp: "2026-07-04"
+---
+
+# Tracy Honea
+
+Current Mayor, Albertville, AL.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/al/counties/marshall/municipalities/boaz/people/david-dyar.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "David Dyar"
+description: "Mayor, Boaz, AL"
+role: "Mayor, Boaz, AL"
+level: "municipal"
+branch: "executive"
+state: "AL"
+tenure:
+  start: "2026-06-20"
+  current: true
+ids:
+  person: "0c7db0bd-f877-4624-a09e-778abf416f71"
+  office: "a83da114-bd32-4d39-b8d5-f7ec8f8ab38d"
+  tenure: "8472c523-0f00-48f7-8126-89434765237a"
+  jurisdiction: "7f12d19f-1431-4d1c-ac4e-b034ba3adfd8"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, al]
+timestamp: "2026-07-04"
+---
+
+# David Dyar
+
+Current Mayor, Boaz, AL.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).