Add elections + demographics layer: candidates and jurisdictions

Two new entity types, built deterministically from the raw exports:

  Candidate (2,494)     — 2026 federal candidates as files under
                          us/states/<st>/candidates/, with office,
                          district, party, incumbent/challenger stance,
                          campaign committee, FEC id.

  Jurisdiction (3,494)  — demographic nodes carrying ACS 2023 data:
                          3,131 counties (deduped from 3,231 mixed-format
                          fips keys) + 363 congressional districts.

This completes the county skeleton nationwide: every US county is now a
browsable node with population, income, poverty, race, education and
housing — even where no officeholders are mapped yet. In Florida the
county index.md merges into the existing dir and reports its officeholder
count alongside demographics (St. Lucie: 33 officeholders + ACS profile).

build.py now reads seven raw inputs in one deterministic pass
(byte-identical on rerun). The mirror now answers: who holds power, who
runs this institution, who is running, and what each place is made of.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

data/jurisdictions/us/states/sc/districts/01.md

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "SC-01"
+classification: congressional-district
+state: "SC"
+district: "SC-01"
+demographics:
+  population: 797468
+  population_under_18: 183507
+  population_18_64: 248406
+  population_65_plus: 365555
+  median_household_income: 95136
+  poverty_rate: 7.27
+  homeownership_rate: 76.59
+  unemployment_rate: 2.59
+  median_home_value: 466400
+  gini_index: 0.4549
+  vacancy_rate: 11.64
+  race_white: 557015
+  race_black: 126917
+  race_asian: 18886
+  hispanic: 69598
+  bachelors_plus: 258317
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, sc]
+timestamp: "2026-07-03"
+---
+
+# SC-01
+
+Congressional district SC-01.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 797468 |
+| Under 18 | 183507 |
+| 18–64 | 248406 |
+| 65+ | 365555 |
+| Median household income | 95136 |
+| Poverty rate | 7.27 |
+| Homeownership rate | 76.59 |
+| Unemployment rate | 2.59 |
+| Median home value | 466400 |
+| Gini index | 0.4549 |
+| Vacancy rate | 11.64 |
+| White | 557015 |
+| Black | 126917 |
+| Asian | 18886 |
+| Hispanic/Latino | 69598 |
+| Bachelor's or higher | 258317 |
+
+## Source
+
+- demographics: Census ACS 2023

data/jurisdictions/us/states/sc/districts/02.md

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "SC-02"
+classification: congressional-district
+state: "SC"
+district: "SC-02"
+demographics:
+  population: 764414
+  population_under_18: 186957
+  population_18_64: 247477
+  population_65_plus: 329980
+  median_household_income: 77683
+  poverty_rate: 11.38
+  homeownership_rate: 74.94
+  unemployment_rate: 5.12
+  median_home_value: 273300
+  gini_index: 0.45
+  vacancy_rate: 9.8
+  race_white: 465999
+  race_black: 195987
+  race_asian: 19233
+  hispanic: 58061
+  bachelors_plus: 200726
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, sc]
+timestamp: "2026-07-03"
+---
+
+# SC-02
+
+Congressional district SC-02.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 764414 |
+| Under 18 | 186957 |
+| 18–64 | 247477 |
+| 65+ | 329980 |
+| Median household income | 77683 |
+| Poverty rate | 11.38 |
+| Homeownership rate | 74.94 |
+| Unemployment rate | 5.12 |
+| Median home value | 273300 |
+| Gini index | 0.45 |
+| Vacancy rate | 9.8 |
+| White | 465999 |
+| Black | 195987 |
+| Asian | 19233 |
+| Hispanic/Latino | 58061 |
+| Bachelor's or higher | 200726 |
+
+## Source
+
+- demographics: Census ACS 2023

data/jurisdictions/us/states/sc/districts/03.md

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "SC-03"
+classification: congressional-district
+state: "SC"
+district: "SC-03"
+demographics:
+  population: 766747
+  population_under_18: 184454
+  population_18_64: 232253
+  population_65_plus: 350040
+  median_household_income: 65919
+  poverty_rate: 15.24
+  homeownership_rate: 75.28
+  unemployment_rate: 5.18
+  median_home_value: 255400
+  gini_index: 0.4713
+  vacancy_rate: 11.59
+  race_white: 566352
+  race_black: 117063
+  race_asian: 8700
+  hispanic: 53227
+  bachelors_plus: 147274
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, sc]
+timestamp: "2026-07-03"
+---
+
+# SC-03
+
+Congressional district SC-03.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 766747 |
+| Under 18 | 184454 |
+| 18–64 | 232253 |
+| 65+ | 350040 |
+| Median household income | 65919 |
+| Poverty rate | 15.24 |
+| Homeownership rate | 75.28 |
+| Unemployment rate | 5.18 |
+| Median home value | 255400 |
+| Gini index | 0.4713 |
+| Vacancy rate | 11.59 |
+| White | 566352 |
+| Black | 117063 |
+| Asian | 8700 |
+| Hispanic/Latino | 53227 |
+| Bachelor's or higher | 147274 |
+
+## Source
+
+- demographics: Census ACS 2023

data/jurisdictions/us/states/sc/districts/04.md

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "SC-04"
+classification: congressional-district
+state: "SC"
+district: "SC-04"
+demographics:
+  population: 810387
+  population_under_18: 203356
+  population_18_64: 274400
+  population_65_plus: 332631
+  median_household_income: 78299
+  poverty_rate: 10.73
+  homeownership_rate: 68.44
+  unemployment_rate: 4.23
+  median_home_value: 309800
+  gini_index: 0.4476
+  vacancy_rate: 7.13
+  race_white: 529805
+  race_black: 136514
+  race_asian: 23101
+  hispanic: 99462
+  bachelors_plus: 205311
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, sc]
+timestamp: "2026-07-03"
+---
+
+# SC-04
+
+Congressional district SC-04.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 810387 |
+| Under 18 | 203356 |
+| 18–64 | 274400 |
+| 65+ | 332631 |
+| Median household income | 78299 |
+| Poverty rate | 10.73 |
+| Homeownership rate | 68.44 |
+| Unemployment rate | 4.23 |
+| Median home value | 309800 |
+| Gini index | 0.4476 |
+| Vacancy rate | 7.13 |
+| White | 529805 |
+| Black | 136514 |
+| Asian | 23101 |
+| Hispanic/Latino | 99462 |
+| Bachelor's or higher | 205311 |
+
+## Source
+
+- demographics: Census ACS 2023

data/jurisdictions/us/states/sc/districts/05.md

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "SC-05"
+classification: congressional-district
+state: "SC"
+district: "SC-05"
+demographics:
+  population: 782718
+  population_under_18: 197034
+  population_18_64: 247333
+  population_65_plus: 338351
+  median_household_income: 75344
+  poverty_rate: 11.64
+  homeownership_rate: 76.93
+  unemployment_rate: 3.76
+  median_home_value: 297000
+  gini_index: 0.4481
+  vacancy_rate: 9.22
+  race_white: 501215
+  race_black: 185391
+  race_asian: 17943
+  hispanic: 50997
+  bachelors_plus: 167087
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, sc]
+timestamp: "2026-07-03"
+---
+
+# SC-05
+
+Congressional district SC-05.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 782718 |
+| Under 18 | 197034 |
+| 18–64 | 247333 |
+| 65+ | 338351 |
+| Median household income | 75344 |
+| Poverty rate | 11.64 |
+| Homeownership rate | 76.93 |
+| Unemployment rate | 3.76 |
+| Median home value | 297000 |
+| Gini index | 0.4481 |
+| Vacancy rate | 9.22 |
+| White | 501215 |
+| Black | 185391 |
+| Asian | 17943 |
+| Hispanic/Latino | 50997 |
+| Bachelor's or higher | 167087 |
+
+## Source
+
+- demographics: Census ACS 2023

data/jurisdictions/us/states/sc/districts/06.md

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "SC-06"
+classification: congressional-district
+state: "SC"
+district: "SC-06"
+demographics:
+  population: 762934
+  population_under_18: 178453
+  population_18_64: 274633
+  population_65_plus: 309848
+  median_household_income: 58458
+  poverty_rate: 17.96
+  homeownership_rate: 59.01
+  unemployment_rate: 5.17
+  median_home_value: 249500
+  gini_index: 0.4804
+  vacancy_rate: 13.1
+  race_white: 329240
+  race_black: 336692
+  race_asian: 13590
+  hispanic: 55776
+  bachelors_plus: 152130
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, sc]
+timestamp: "2026-07-03"
+---
+
+# SC-06
+
+Congressional district SC-06.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 762934 |
+| Under 18 | 178453 |
+| 18–64 | 274633 |
+| 65+ | 309848 |
+| Median household income | 58458 |
+| Poverty rate | 17.96 |
+| Homeownership rate | 59.01 |
+| Unemployment rate | 5.17 |
+| Median home value | 249500 |
+| Gini index | 0.4804 |
+| Vacancy rate | 13.1 |
+| White | 329240 |
+| Black | 336692 |
+| Asian | 13590 |
+| Hispanic/Latino | 55776 |
+| Bachelor's or higher | 152130 |
+
+## Source
+
+- demographics: Census ACS 2023

data/jurisdictions/us/states/sc/districts/07.md

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "SC-07"
+classification: congressional-district
+state: "SC"
+district: "SC-07"
+demographics:
+  population: 794163
+  population_under_18: 171572
+  population_18_64: 214666
+  population_65_plus: 407925
+  median_household_income: 61149
+  poverty_rate: 19.04
+  homeownership_rate: 75.19
+  unemployment_rate: 5.68
+  median_home_value: 275900
+  gini_index: 0.4699
+  vacancy_rate: 20.86
+  race_white: 512383
+  race_black: 196382
+  race_asian: 8254
+  hispanic: 47096
+  bachelors_plus: 144444
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, sc]
+timestamp: "2026-07-03"
+---
+
+# SC-07
+
+Congressional district SC-07.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 794163 |
+| Under 18 | 171572 |
+| 18–64 | 214666 |
+| 65+ | 407925 |
+| Median household income | 61149 |
+| Poverty rate | 19.04 |
+| Homeownership rate | 75.19 |
+| Unemployment rate | 5.68 |
+| Median home value | 275900 |
+| Gini index | 0.4699 |
+| Vacancy rate | 20.86 |
+| White | 512383 |
+| Black | 196382 |
+| Asian | 8254 |
+| Hispanic/Latino | 47096 |
+| Bachelor's or higher | 144444 |
+
+## Source
+
+- demographics: Census ACS 2023