Sync: officeholders v3 — fresh export from live Atlas DB (13,329 tenures)

Re-exported directly from Postgres (10.0.0.116), not Atlas's introspection,
which under-reported the roster (its v3 export had 11,473, missing the
restored Florida League of Cities municipal set). Live DB current tenures:
state 7,561 · municipal 4,009 · county 1,217 · federal 542.

- build.py now reads officeholders-v3.jsonl (was v2); dataset vintage 2026-07-04
- fixed one corrupt start_date at source-export (21021-12-03 -> 2021-12-03,
  Lorraine Borowski, Mayor of Decorah IA)
- scripts/build_viz.py: committed, deterministic generator for the Board's
  county_data.json / county_detail.json (previously built ad-hoc)
- generate_changelog.py: ignore files whose only change is the vintage stamp,
  so the diff reflects government change, not re-export bookkeeping

Person files 11,285 -> 13,329. Non-FL municipal officials (1,903) are in the
tree but not yet county-mappable (place->county crosswalk still NULL).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

data/jurisdictions/us/states/fl/counties/pasco/people/jack-mariano.md

@@ -0,0 +1,43 @@
+---
+type: Person
+title: "Jack Mariano"
+description: "Commissioner, Pasco County — Pasco County, FL"
+role: "Commissioner, Pasco County"
+party: "R"
+level: "county"
+branch: "legislative"
+state: "FL"
+contact:
+  email: "jmariano@pascocountyfl.net"
+  phone: "(727) 847-8100"
+tenure:
+  start: "2025-01-01"
+  current: true
+ids:
+  person: "562e268c-0758-47c4-9bb9-52cb7be4e19e"
+  office: "090e49bf-1b51-4c62-8797-9ff127cd2c1a"
+  tenure: "4bd1f87d-5799-42da-8fc0-c3f0a5a8a120"
+  jurisdiction: "54545d63-65d6-459b-a434-71256e93afb9"
+sources:
+  - field: office
+    source: "Florida Association of Counties"
+  - field: tenure
+    source: "Florida Association of Counties"
+  - field: jurisdiction
+    source: "Census TIGER 2024"
+confidence: official
+tags: [officeholder, county, legislative, fl]
+timestamp: "2026-07-04"
+---
+
+# Jack Mariano
+
+Current Commissioner, Pasco County (Pasco County, FL).
+
+## Sources
+
+- office: Florida Association of Counties
+- tenure: Florida Association of Counties
+- jurisdiction: Census TIGER 2024
+
+Generated from the Atlas officeholders v3 export (2026-07-04).