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/nm/districts/01.md

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "NM-01"
+classification: congressional-district
+state: "NM"
+district: "NM-01"
+demographics:
+  population: 711081
+  population_under_18: 151168
+  population_18_64: 240783
+  population_65_plus: 319130
+  median_household_income: 77246
+  poverty_rate: 12.48
+  homeownership_rate: 67.5
+  unemployment_rate: 4.79
+  median_home_value: 341800
+  gini_index: 0.4624
+  vacancy_rate: 8.93
+  race_white: 394489
+  race_black: 21627
+  race_asian: 25608
+  hispanic: 303587
+  bachelors_plus: 208329
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, nm]
+timestamp: "2026-07-03"
+---
+
+# NM-01
+
+Congressional district NM-01.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 711081 |
+| Under 18 | 151168 |
+| 18–64 | 240783 |
+| 65+ | 319130 |
+| Median household income | 77246 |
+| Poverty rate | 12.48 |
+| Homeownership rate | 67.5 |
+| Unemployment rate | 4.79 |
+| Median home value | 341800 |
+| Gini index | 0.4624 |
+| Vacancy rate | 8.93 |
+| White | 394489 |
+| Black | 21627 |
+| Asian | 25608 |
+| Hispanic/Latino | 303587 |
+| Bachelor's or higher | 208329 |
+
+## Source
+
+- demographics: Census ACS 2023

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

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "NM-02"
+classification: congressional-district
+state: "NM"
+district: "NM-02"
+demographics:
+  population: 710491
+  population_under_18: 176382
+  population_18_64: 240666
+  population_65_plus: 293443
+  median_household_income: 60933
+  poverty_rate: 18.6
+  homeownership_rate: 72.95
+  unemployment_rate: 6.03
+  median_home_value: 236400
+  gini_index: 0.465
+  vacancy_rate: 13.14
+  race_white: 281734
+  race_black: 18868
+  race_asian: 7414
+  hispanic: 431448
+  bachelors_plus: 113714
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, nm]
+timestamp: "2026-07-03"
+---
+
+# NM-02
+
+Congressional district NM-02.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 710491 |
+| Under 18 | 176382 |
+| 18–64 | 240666 |
+| 65+ | 293443 |
+| Median household income | 60933 |
+| Poverty rate | 18.6 |
+| Homeownership rate | 72.95 |
+| Unemployment rate | 6.03 |
+| Median home value | 236400 |
+| Gini index | 0.465 |
+| Vacancy rate | 13.14 |
+| White | 281734 |
+| Black | 18868 |
+| Asian | 7414 |
+| Hispanic/Latino | 431448 |
+| Bachelor's or higher | 113714 |
+
+## Source
+
+- demographics: Census ACS 2023

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

@@ -0,0 +1,59 @@
+---
+type: Jurisdiction
+title: "NM-03"
+classification: congressional-district
+state: "NM"
+district: "NM-03"
+demographics:
+  population: 708684
+  population_under_18: 171955
+  population_18_64: 226137
+  population_65_plus: 310592
+  median_household_income: 66346
+  poverty_rate: 18.21
+  homeownership_rate: 73.12
+  unemployment_rate: 5.04
+  median_home_value: 256900
+  gini_index: 0.4822
+  vacancy_rate: 14.07
+  race_white: 311180
+  race_black: 9555
+  race_asian: 9622
+  hispanic: 311218
+  bachelors_plus: 150100
+sources:
+  - field: demographics
+    source: Census ACS 2023
+confidence: official
+tags: [jurisdiction, congressional-district, nm]
+timestamp: "2026-07-03"
+---
+
+# NM-03
+
+Congressional district NM-03.
+
+## Demographics (ACS 2023)
+
+| Measure | Value |
+| --- | --- |
+| Population | 708684 |
+| Under 18 | 171955 |
+| 18–64 | 226137 |
+| 65+ | 310592 |
+| Median household income | 66346 |
+| Poverty rate | 18.21 |
+| Homeownership rate | 73.12 |
+| Unemployment rate | 5.04 |
+| Median home value | 256900 |
+| Gini index | 0.4822 |
+| Vacancy rate | 14.07 |
+| White | 311180 |
+| Black | 9555 |
+| Asian | 9622 |
+| Hispanic/Latino | 311218 |
+| Bachelor's or higher | 150100 |
+
+## Source
+
+- demographics: Census ACS 2023