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/ma/districts/01.md

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+---
+type: Jurisdiction
+title: "MA-01"
+classification: congressional-district
+state: "MA"
+district: "MA-01"
+demographics:
+  population: 779993
+  population_under_18: 173169
+  population_18_64: 252835
+  population_65_plus: 353989
+  median_household_income: 75462
+  poverty_rate: 13.82
+  homeownership_rate: 66.69
+  unemployment_rate: 3.99
+  median_home_value: 345400
+  gini_index: 0.4548
+  vacancy_rate: 8.16
+  race_white: 547387
+  race_black: 47733
+  race_asian: 21193
+  hispanic: 157307
+  bachelors_plus: 181603
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, ma]
+timestamp: "2026-07-03"
+---
+
+# MA-01
+
+Congressional district MA-01.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 779993 |
+| Under 18 | 173169 |
+| 18–64 | 252835 |
+| 65+ | 353989 |
+| Median household income | 75462 |
+| Poverty rate | 13.82 |
+| Homeownership rate | 66.69 |
+| Unemployment rate | 3.99 |
+| Median home value | 345400 |
+| Gini index | 0.4548 |
+| Vacancy rate | 8.16 |
+| White | 547387 |
+| Black | 47733 |
+| Asian | 21193 |
+| Hispanic/Latino | 157307 |
+| Bachelor's or higher | 181603 |
+
+## Source
+
+- demographics: Census ACS 2023

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

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+---
+type: Jurisdiction
+title: "MA-02"
+classification: congressional-district
+state: "MA"
+district: "MA-02"
+demographics:
+  population: 801772
+  population_under_18: 180818
+  population_18_64: 262864
+  population_65_plus: 358090
+  median_household_income: 97024
+  poverty_rate: 9.23
+  homeownership_rate: 66.37
+  unemployment_rate: 4.1
+  median_home_value: 485300
+  gini_index: 0.455
+  vacancy_rate: 5.08
+  race_white: 565823
+  race_black: 43183
+  race_asian: 61199
+  hispanic: 92763
+  bachelors_plus: 266581
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, ma]
+timestamp: "2026-07-03"
+---
+
+# MA-02
+
+Congressional district MA-02.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 801772 |
+| Under 18 | 180818 |
+| 18–64 | 262864 |
+| 65+ | 358090 |
+| Median household income | 97024 |
+| Poverty rate | 9.23 |
+| Homeownership rate | 66.37 |
+| Unemployment rate | 4.1 |
+| Median home value | 485300 |
+| Gini index | 0.455 |
+| Vacancy rate | 5.08 |
+| White | 565823 |
+| Black | 43183 |
+| Asian | 61199 |
+| Hispanic/Latino | 92763 |
+| Bachelor's or higher | 266581 |
+
+## Source
+
+- demographics: Census ACS 2023

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

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "MA-03"
+classification: congressional-district
+state: "MA"
+district: "MA-03"
+demographics:
+  population: 792213
+  population_under_18: 193952
+  population_18_64: 254877
+  population_65_plus: 343384
+  median_household_income: 98501
+  poverty_rate: 10.71
+  homeownership_rate: 61.82
+  unemployment_rate: 4.88
+  median_home_value: 553500
+  gini_index: 0.4635
+  vacancy_rate: 3.43
+  race_white: 458735
+  race_black: 38899
+  race_asian: 71224
+  hispanic: 196213
+  bachelors_plus: 217318
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, ma]
+timestamp: "2026-07-03"
+---
+
+# MA-03
+
+Congressional district MA-03.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 792213 |
+| Under 18 | 193952 |
+| 18–64 | 254877 |
+| 65+ | 343384 |
+| Median household income | 98501 |
+| Poverty rate | 10.71 |
+| Homeownership rate | 61.82 |
+| Unemployment rate | 4.88 |
+| Median home value | 553500 |
+| Gini index | 0.4635 |
+| Vacancy rate | 3.43 |
+| White | 458735 |
+| Black | 38899 |
+| Asian | 71224 |
+| Hispanic/Latino | 196213 |
+| Bachelor's or higher | 217318 |
+
+## Source
+
+- demographics: Census ACS 2023

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

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+---
+type: Jurisdiction
+title: "MA-04"
+classification: congressional-district
+state: "MA"
+district: "MA-04"
+demographics:
+  population: 802402
+  population_under_18: 187006
+  population_18_64: 248358
+  population_65_plus: 367038
+  median_household_income: 115485
+  poverty_rate: 6.47
+  homeownership_rate: 67.7
+  unemployment_rate: 3.4
+  median_home_value: 641000
+  gini_index: 0.4853
+  vacancy_rate: 4.22
+  race_white: 603117
+  race_black: 39241
+  race_asian: 57984
+  hispanic: 55341
+  bachelors_plus: 285275
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, ma]
+timestamp: "2026-07-03"
+---
+
+# MA-04
+
+Congressional district MA-04.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 802402 |
+| Under 18 | 187006 |
+| 18–64 | 248358 |
+| 65+ | 367038 |
+| Median household income | 115485 |
+| Poverty rate | 6.47 |
+| Homeownership rate | 67.7 |
+| Unemployment rate | 3.4 |
+| Median home value | 641000 |
+| Gini index | 0.4853 |
+| Vacancy rate | 4.22 |
+| White | 603117 |
+| Black | 39241 |
+| Asian | 57984 |
+| Hispanic/Latino | 55341 |
+| Bachelor's or higher | 285275 |
+
+## Source
+
+- demographics: Census ACS 2023

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

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+---
+type: Jurisdiction
+title: "MA-05"
+classification: congressional-district
+state: "MA"
+district: "MA-05"
+demographics:
+  population: 790877
+  population_under_18: 177378
+  population_18_64: 287327
+  population_65_plus: 326172
+  median_household_income: 136612
+  poverty_rate: 7.48
+  homeownership_rate: 56.56
+  unemployment_rate: 3.85
+  median_home_value: 852700
+  gini_index: 0.4769
+  vacancy_rate: 5.21
+  race_white: 486249
+  race_black: 40932
+  race_asian: 116769
+  hispanic: 89816
+  bachelors_plus: 350781
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, ma]
+timestamp: "2026-07-03"
+---
+
+# MA-05
+
+Congressional district MA-05.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 790877 |
+| Under 18 | 177378 |
+| 18–64 | 287327 |
+| 65+ | 326172 |
+| Median household income | 136612 |
+| Poverty rate | 7.48 |
+| Homeownership rate | 56.56 |
+| Unemployment rate | 3.85 |
+| Median home value | 852700 |
+| Gini index | 0.4769 |
+| Vacancy rate | 5.21 |
+| White | 486249 |
+| Black | 40932 |
+| Asian | 116769 |
+| Hispanic/Latino | 89816 |
+| Bachelor's or higher | 350781 |
+
+## Source
+
+- demographics: Census ACS 2023

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

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "MA-06"
+classification: congressional-district
+state: "MA"
+district: "MA-06"
+demographics:
+  population: 796651
+  population_under_18: 177957
+  population_18_64: 247017
+  population_65_plus: 371677
+  median_household_income: 121409
+  poverty_rate: 7.22
+  homeownership_rate: 69.42
+  unemployment_rate: 3.74
+  median_home_value: 705600
+  gini_index: 0.4754
+  vacancy_rate: 4.86
+  race_white: 598614
+  race_black: 27572
+  race_asian: 40255
+  hispanic: 108780
+  bachelors_plus: 292135
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, ma]
+timestamp: "2026-07-03"
+---
+
+# MA-06
+
+Congressional district MA-06.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 796651 |
+| Under 18 | 177957 |
+| 18–64 | 247017 |
+| 65+ | 371677 |
+| Median household income | 121409 |
+| Poverty rate | 7.22 |
+| Homeownership rate | 69.42 |
+| Unemployment rate | 3.74 |
+| Median home value | 705600 |
+| Gini index | 0.4754 |
+| Vacancy rate | 4.86 |
+| White | 598614 |
+| Black | 27572 |
+| Asian | 40255 |
+| Hispanic/Latino | 108780 |
+| Bachelor's or higher | 292135 |
+
+## Source
+
+- demographics: Census ACS 2023

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

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "MA-07"
+classification: congressional-district
+state: "MA"
+district: "MA-07"
+demographics:
+  population: 789900
+  population_under_18: 160778
+  population_18_64: 377852
+  population_65_plus: 251270
+  median_household_income: 98603
+  poverty_rate: 16.35
+  homeownership_rate: 34.21
+  unemployment_rate: 4.36
+  median_home_value: 687400
+  gini_index: 0.5006
+  vacancy_rate: 6.42
+  race_white: 320490
+  race_black: 155669
+  race_asian: 91046
+  hispanic: 183358
+  bachelors_plus: 272970
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, ma]
+timestamp: "2026-07-03"
+---
+
+# MA-07
+
+Congressional district MA-07.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 789900 |
+| Under 18 | 160778 |
+| 18–64 | 377852 |
+| 65+ | 251270 |
+| Median household income | 98603 |
+| Poverty rate | 16.35 |
+| Homeownership rate | 34.21 |
+| Unemployment rate | 4.36 |
+| Median home value | 687400 |
+| Gini index | 0.5006 |
+| Vacancy rate | 6.42 |
+| White | 320490 |
+| Black | 155669 |
+| Asian | 91046 |
+| Hispanic/Latino | 183358 |
+| Bachelor's or higher | 272970 |
+
+## Source
+
+- demographics: Census ACS 2023

data/jurisdictions/us/states/ma/districts/08.md

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "MA-08"
+classification: congressional-district
+state: "MA"
+district: "MA-08"
+demographics:
+  population: 784982
+  population_under_18: 158234
+  population_18_64: 295230
+  population_65_plus: 331518
+  median_household_income: 118563
+  poverty_rate: 8.08
+  homeownership_rate: 60.76
+  unemployment_rate: 3.88
+  median_home_value: 664600
+  gini_index: 0.4778
+  vacancy_rate: 4.95
+  race_white: 512563
+  race_black: 77162
+  race_asian: 81048
+  hispanic: 61166
+  bachelors_plus: 318455
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, ma]
+timestamp: "2026-07-03"
+---
+
+# MA-08
+
+Congressional district MA-08.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 784982 |
+| Under 18 | 158234 |
+| 18–64 | 295230 |
+| 65+ | 331518 |
+| Median household income | 118563 |
+| Poverty rate | 8.08 |
+| Homeownership rate | 60.76 |
+| Unemployment rate | 3.88 |
+| Median home value | 664600 |
+| Gini index | 0.4778 |
+| Vacancy rate | 4.95 |
+| White | 512563 |
+| Black | 77162 |
+| Asian | 81048 |
+| Hispanic/Latino | 61166 |
+| Bachelor's or higher | 318455 |
+
+## Source
+
+- demographics: Census ACS 2023

data/jurisdictions/us/states/ma/districts/09.md

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "MA-09"
+classification: congressional-district
+state: "MA"
+district: "MA-09"
+demographics:
+  population: 797381
+  population_under_18: 157507
+  population_18_64: 224588
+  population_65_plus: 415286
+  median_household_income: 101312
+  poverty_rate: 8.55
+  homeownership_rate: 77.27
+  unemployment_rate: 4.48
+  median_home_value: 645400
+  gini_index: 0.4701
+  vacancy_rate: 20.69
+  race_white: 668151
+  race_black: 19099
+  race_asian: 10861
+  hispanic: 54051
+  bachelors_plus: 264452
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, ma]
+timestamp: "2026-07-03"
+---
+
+# MA-09
+
+Congressional district MA-09.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 797381 |
+| Under 18 | 157507 |
+| 18–64 | 224588 |
+| 65+ | 415286 |
+| Median household income | 101312 |
+| Poverty rate | 8.55 |
+| Homeownership rate | 77.27 |
+| Unemployment rate | 4.48 |
+| Median home value | 645400 |
+| Gini index | 0.4701 |
+| Vacancy rate | 20.69 |
+| White | 668151 |
+| Black | 19099 |
+| Asian | 10861 |
+| Hispanic/Latino | 54051 |
+| Bachelor's or higher | 264452 |
+
+## Source
+
+- demographics: Census ACS 2023