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/brazos/index.md

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

data/jurisdictions/us/states/tx/counties/brazos/municipalities/bryan/people/bobby-gutierrez.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Bobby Gutierrez"
+description: "Mayor, Bryan, TX"
+role: "Mayor, Bryan, TX"
+level: "municipal"
+branch: "executive"
+state: "TX"
+tenure:
+  start: "2022-11-01"
+  current: true
+ids:
+  person: "d2301977-e278-4a14-a460-176e18f32f0a"
+  office: "debd8c51-6040-42fd-aad9-7aa7be23e7b0"
+  tenure: "e8683c51-e553-45e8-8791-ed8fcabc6276"
+  jurisdiction: "cb6dff0c-5b7c-4e2d-b81f-45db07ac1971"
+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"
+---
+
+# Bobby Gutierrez
+
+Current Mayor, Bryan, 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/brazos/municipalities/college-station/people/karl-mooney.md

@@ -0,0 +1,39 @@
+---
+type: Person
+title: "Karl Mooney"
+description: "Mayor, College Station, TX"
+role: "Mayor, College Station, TX"
+level: "municipal"
+branch: "executive"
+state: "TX"
+tenure:
+  start: "2016-11-01"
+  current: true
+ids:
+  person: "7e23a16b-81dd-4b11-a9ed-0c11ef4d8f16"
+  office: "e8488423-9e06-4b17-9f67-88d1acfcba8c"
+  tenure: "4e39e556-fce4-4cb8-8df5-e5503125169c"
+  jurisdiction: "fcdffe86-4d9f-4584-8da7-4ae990709c54"
+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"
+---
+
+# Karl Mooney
+
+Current Mayor, College Station, TX.
+
+## Sources
+
+- office: Wikidata
+- tenure: Wikidata
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).