Implement Cedar Park council scraper

[ThatXliner]

Closes #170.

What changed

• Adds the Cedar Park Council source using the official Municode Meetings embed now linked by the City.
• Adds meeting discovery, document caching/checksums, PDF extraction, and deterministic agenda/minutes parsing.
• Persists meetings, document versions, agenda items, motions/outcomes, and votes.
• Adds provider-neutral readers and local-government tRPC routes.
• Covers the latest 12 months and includes regular, special, cancelled, and amended fixtures.

Validation

• 16 scraper tests and 5 API tests.
• Scraper, API, DB, and environment typechecks.
• Targeted lint and production scraper build.
• Live discovery found 34 meetings; official PDF smoke test parsed 20 items.

Notes

The live Council source moved from CivicEngage Agenda Center to the City's official Municode embed. A DB smoke run was not performed because POSTGRES_URL was unset. Provider-neutral local-government schema files overlap with #166 and #167.

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Superseded by consolidated PR #181, which combines the North Carolina and Texas current-cycle scrapers and resolves the shared local-government schema/API overlap.