Implement Texas current-election sources

[ThatXliner]

Closes #169.

What changed

• Adds current-cycle Texas SOS/TLC scraper and checksum-based snapshot persistence.
• Normalizes contests, candidates, county totals, turnout, status, outcomes, and TLC analyses.
• Adds civic.getTexasCurrentElection with no historical browsing input.
• Integrates official Texas proposition data into measure enrichment while keeping SOS facts and TLC explanation separately cited.
• Adds migration, fixtures for two TLC layouts, diagnostics, tests, and documentation.

Validation

• 12 API tests and 14 scraper tests.
• DB, API, and scraper typechecks.
• Diff checks.
• Live parse: 8 current SOS elections, 17 amendment contests, 254 counties, and all 17 TLC analyses.

Notes

The migration must be applied before running the scraper. Shared election schema and Civic/measure registration files overlap with #165.

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[ThatXliner]

Superseded by consolidated PR #181, which combines the North Carolina and Texas current-cycle scrapers and resolves the shared local-government schema/API overlap.