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/md/districts/01.md

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "MD-01"
+classification: congressional-district
+state: "MD"
+district: "MD-01"
+demographics:
+  population: 791864
+  population_under_18: 181253
+  population_18_64: 241624
+  population_65_plus: 368987
+  median_household_income: 95306
+  poverty_rate: 9.4
+  homeownership_rate: 76.46
+  unemployment_rate: 4.1
+  median_home_value: 378700
+  gini_index: 0.4325
+  vacancy_rate: 14.43
+  race_white: 564937
+  race_black: 106211
+  race_asian: 24442
+  hispanic: 53251
+  bachelors_plus: 208307
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, md]
+timestamp: "2026-07-03"
+---
+
+# MD-01
+
+Congressional district MD-01.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 791864 |
+| Under 18 | 181253 |
+| 18–64 | 241624 |
+| 65+ | 368987 |
+| Median household income | 95306 |
+| Poverty rate | 9.4 |
+| Homeownership rate | 76.46 |
+| Unemployment rate | 4.1 |
+| Median home value | 378700 |
+| Gini index | 0.4325 |
+| Vacancy rate | 14.43 |
+| White | 564937 |
+| Black | 106211 |
+| Asian | 24442 |
+| Hispanic/Latino | 53251 |
+| Bachelor's or higher | 208307 |
+
+## Source
+
+- demographics: Census ACS 2023

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

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "MD-02"
+classification: congressional-district
+state: "MD"
+district: "MD-02"
+demographics:
+  population: 783097
+  population_under_18: 194901
+  population_18_64: 247723
+  population_65_plus: 340473
+  median_household_income: 94537
+  poverty_rate: 8.43
+  homeownership_rate: 67.65
+  unemployment_rate: 4.1
+  median_home_value: 393900
+  gini_index: 0.4571
+  vacancy_rate: 4.13
+  race_white: 456620
+  race_black: 207838
+  race_asian: 43501
+  hispanic: 51409
+  bachelors_plus: 257620
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, md]
+timestamp: "2026-07-03"
+---
+
+# MD-02
+
+Congressional district MD-02.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 783097 |
+| Under 18 | 194901 |
+| 18–64 | 247723 |
+| 65+ | 340473 |
+| Median household income | 94537 |
+| Poverty rate | 8.43 |
+| Homeownership rate | 67.65 |
+| Unemployment rate | 4.1 |
+| Median home value | 393900 |
+| Gini index | 0.4571 |
+| Vacancy rate | 4.13 |
+| White | 456620 |
+| Black | 207838 |
+| Asian | 43501 |
+| Hispanic/Latino | 51409 |
+| Bachelor's or higher | 257620 |
+
+## Source
+
+- demographics: Census ACS 2023

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

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "MD-03"
+classification: congressional-district
+state: "MD"
+district: "MD-03"
+demographics:
+  population: 782840
+  population_under_18: 187732
+  population_18_64: 259832
+  population_65_plus: 335276
+  median_household_income: 136641
+  poverty_rate: 6.38
+  homeownership_rate: 74.17
+  unemployment_rate: 3.46
+  median_home_value: 539800
+  gini_index: 0.4168
+  vacancy_rate: 4.64
+  race_white: 440263
+  race_black: 142138
+  race_asian: 87038
+  hispanic: 79419
+  bachelors_plus: 293087
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, md]
+timestamp: "2026-07-03"
+---
+
+# MD-03
+
+Congressional district MD-03.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 782840 |
+| Under 18 | 187732 |
+| 18–64 | 259832 |
+| 65+ | 335276 |
+| Median household income | 136641 |
+| Poverty rate | 6.38 |
+| Homeownership rate | 74.17 |
+| Unemployment rate | 3.46 |
+| Median home value | 539800 |
+| Gini index | 0.4168 |
+| Vacancy rate | 4.64 |
+| White | 440263 |
+| Black | 142138 |
+| Asian | 87038 |
+| Hispanic/Latino | 79419 |
+| Bachelor's or higher | 293087 |
+
+## Source
+
+- demographics: Census ACS 2023

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

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "MD-04"
+classification: congressional-district
+state: "MD"
+district: "MD-04"
+demographics:
+  population: 763420
+  population_under_18: 192590
+  population_18_64: 266917
+  population_65_plus: 303913
+  median_household_income: 87647
+  poverty_rate: 11.98
+  homeownership_rate: 55.99
+  unemployment_rate: 5.61
+  median_home_value: 414200
+  gini_index: 0.436
+  vacancy_rate: 5.22
+  race_white: 87429
+  race_black: 411415
+  race_asian: 35367
+  hispanic: 214826
+  bachelors_plus: 181513
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, md]
+timestamp: "2026-07-03"
+---
+
+# MD-04
+
+Congressional district MD-04.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 763420 |
+| Under 18 | 192590 |
+| 18–64 | 266917 |
+| 65+ | 303913 |
+| Median household income | 87647 |
+| Poverty rate | 11.98 |
+| Homeownership rate | 55.99 |
+| Unemployment rate | 5.61 |
+| Median home value | 414200 |
+| Gini index | 0.436 |
+| Vacancy rate | 5.22 |
+| White | 87429 |
+| Black | 411415 |
+| Asian | 35367 |
+| Hispanic/Latino | 214826 |
+| Bachelor's or higher | 181513 |
+
+## Source
+
+- demographics: Census ACS 2023

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

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "MD-05"
+classification: congressional-district
+state: "MD"
+district: "MD-05"
+demographics:
+  population: 805367
+  population_under_18: 202262
+  population_18_64: 258462
+  population_65_plus: 344643
+  median_household_income: 128699
+  poverty_rate: 5.54
+  homeownership_rate: 80.61
+  unemployment_rate: 3.77
+  median_home_value: 477500
+  gini_index: 0.3961
+  vacancy_rate: 5.75
+  race_white: 341920
+  race_black: 329302
+  race_asian: 26054
+  hispanic: 70751
+  bachelors_plus: 242267
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, md]
+timestamp: "2026-07-03"
+---
+
+# MD-05
+
+Congressional district MD-05.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 805367 |
+| Under 18 | 202262 |
+| 18–64 | 258462 |
+| 65+ | 344643 |
+| Median household income | 128699 |
+| Poverty rate | 5.54 |
+| Homeownership rate | 80.61 |
+| Unemployment rate | 3.77 |
+| Median home value | 477500 |
+| Gini index | 0.3961 |
+| Vacancy rate | 5.75 |
+| White | 341920 |
+| Black | 329302 |
+| Asian | 26054 |
+| Hispanic/Latino | 70751 |
+| Bachelor's or higher | 242267 |
+
+## Source
+
+- demographics: Census ACS 2023

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

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "MD-06"
+classification: congressional-district
+state: "MD"
+district: "MD-06"
+demographics:
+  population: 821685
+  population_under_18: 202022
+  population_18_64: 267111
+  population_65_plus: 352552
+  median_household_income: 105125
+  poverty_rate: 8.11
+  homeownership_rate: 71.2
+  unemployment_rate: 3.49
+  median_home_value: 433800
+  gini_index: 0.4309
+  vacancy_rate: 7.12
+  race_white: 479026
+  race_black: 107619
+  race_asian: 80725
+  hispanic: 123966
+  bachelors_plus: 235117
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, md]
+timestamp: "2026-07-03"
+---
+
+# MD-06
+
+Congressional district MD-06.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 821685 |
+| Under 18 | 202022 |
+| 18–64 | 267111 |
+| 65+ | 352552 |
+| Median household income | 105125 |
+| Poverty rate | 8.11 |
+| Homeownership rate | 71.2 |
+| Unemployment rate | 3.49 |
+| Median home value | 433800 |
+| Gini index | 0.4309 |
+| Vacancy rate | 7.12 |
+| White | 479026 |
+| Black | 107619 |
+| Asian | 80725 |
+| Hispanic/Latino | 123966 |
+| Bachelor's or higher | 235117 |
+
+## Source
+
+- demographics: Census ACS 2023

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

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "MD-07"
+classification: congressional-district
+state: "MD"
+district: "MD-07"
+demographics:
+  population: 741484
+  population_under_18: 173772
+  population_18_64: 281040
+  population_65_plus: 286672
+  median_household_income: 66738
+  poverty_rate: 16.17
+  homeownership_rate: 51.85
+  unemployment_rate: 6.2
+  median_home_value: 254400
+  gini_index: 0.4693
+  vacancy_rate: 9.25
+  race_white: 225062
+  race_black: 390025
+  race_asian: 26509
+  hispanic: 74087
+  bachelors_plus: 177806
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, md]
+timestamp: "2026-07-03"
+---
+
+# MD-07
+
+Congressional district MD-07.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 741484 |
+| Under 18 | 173772 |
+| 18–64 | 281040 |
+| 65+ | 286672 |
+| Median household income | 66738 |
+| Poverty rate | 16.17 |
+| Homeownership rate | 51.85 |
+| Unemployment rate | 6.2 |
+| Median home value | 254400 |
+| Gini index | 0.4693 |
+| Vacancy rate | 9.25 |
+| White | 225062 |
+| Black | 390025 |
+| Asian | 26509 |
+| Hispanic/Latino | 74087 |
+| Bachelor's or higher | 177806 |
+
+## Source
+
+- demographics: Census ACS 2023

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

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "MD-08"
+classification: congressional-district
+state: "MD"
+district: "MD-08"
+demographics:
+  population: 773463
+  population_under_18: 187841
+  population_18_64: 238137
+  population_65_plus: 347485
+  median_household_income: 146362
+  poverty_rate: 7.16
+  homeownership_rate: 65.28
+  unemployment_rate: 4.19
+  median_home_value: 713400
+  gini_index: 0.4802
+  vacancy_rate: 5.33
+  race_white: 342153
+  race_black: 130574
+  race_asian: 110769
+  hispanic: 163239
+  bachelors_plus: 354562
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, md]
+timestamp: "2026-07-03"
+---
+
+# MD-08
+
+Congressional district MD-08.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 773463 |
+| Under 18 | 187841 |
+| 18–64 | 238137 |
+| 65+ | 347485 |
+| Median household income | 146362 |
+| Poverty rate | 7.16 |
+| Homeownership rate | 65.28 |
+| Unemployment rate | 4.19 |
+| Median home value | 713400 |
+| Gini index | 0.4802 |
+| Vacancy rate | 5.33 |
+| White | 342153 |
+| Black | 130574 |
+| Asian | 110769 |
+| Hispanic/Latino | 163239 |
+| Bachelor's or higher | 354562 |
+
+## Source
+
+- demographics: Census ACS 2023