add tangled.org as hub data source
fetch issues/PRs from PDS via com.atproto.repo.listRecords (no auth),
persist to DuckDB, score with dbt, and serve through the unified
hub_action_items mart alongside github data.
also includes the source-agnostic UI refactor: componentized card table
with filtering, source badges, and multi-source URL helpers.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>