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/tx/counties/burnet/index.md

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

data/jurisdictions/us/states/tx/counties/burnet/municipalities/burnet/people/gary-wideman.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Gary Wideman"
+description: "Mayor, Burnet, TX"
+role: "Mayor, Burnet, TX"
+level: "municipal"
+branch: "executive"
+state: "TX"
+tenure:
+  start: "2023-05-01"
+  current: true
+ids:
+  person: "bf619856-514b-42e4-b1a5-2075b4ab41ec"
+  office: "a1b57f89-a61f-4825-8100-8839b1e4e562"
+  tenure: "0d432f19-9ae3-48e6-8610-c10a2cce49ea"
+  jurisdiction: "29d2d052-13f7-4a71-8e87-cef003b78738"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, tx]
+timestamp: "2026-07-04"
+---
+
+# Gary Wideman
+
+Current Mayor, Burnet, TX.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).

data/jurisdictions/us/states/tx/counties/burnet/municipalities/marble-falls/people/dave-rhodes.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Dave Rhodes"
+description: "Mayor, Marble Falls, TX"
+role: "Mayor, Marble Falls, TX"
+level: "municipal"
+branch: "executive"
+state: "TX"
+tenure:
+  start: "2023-01-01"
+  current: true
+ids:
+  person: "c3112f97-6be3-43b7-afa3-254e9229a93c"
+  office: "a5a185fc-f790-4936-b787-38d6fee500ea"
+  tenure: "ce27b551-b4e7-4cfb-acbc-f3f759dd7128"
+  jurisdiction: "7bd7f36c-00ce-485a-9c81-0bc2c952e546"
+sources:
+  - field: office
+    source: "Wikidata"
+  - field: tenure
+    source: "Wikidata"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, municipal, executive, tx]
+timestamp: "2026-07-04"
+---
+
+# Dave Rhodes
+
+Current Mayor, Marble Falls, TX.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).