Tuva 1.0 core refactor

[aneiderhiser]

Summary

• Refactors the Tuva repository into the Tuva Core 1.0 dbt package branch.
• Removes docs and DAG Viewer from this branch so Tuva Core remains a lightweight dbt package.
• Moves data marts to external package dependencies and keeps Tuva Core focused on input layer, normalized layer, claims preprocessing, core, data assets, and neutral data quality outputs.
• Cleans up CI to use one matrix workflow plus one /ci comment router, with duplicate/archive warehouse workflows removed.

CI Cleanup

• /ci runs Snowflake Tuva Core seed + run.
• /ci build runs Tuva Core build across active warehouses.
• /ci marts runs Snowflake seed + run across Tuva Core plus external data mart packages.
• Redshift remains explicit-only while its CI warehouse is turned off.
• Baseline seed schema reuse was removed so CI writes all resources into the run-scoped schema family.

Local Validation

• python -m unittest scripts/test_parse_ci_command.py
• python -m py_compile scripts/parse_ci_command.py scripts/test_parse_ci_command.py
• YAML parse for .github/**/*.yml
• scripts/dbt-local deps && scripts/dbt-local parse --no-partial-parse

Release Note Label

• breaking-change

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[aneiderhiser]

/ci

[github-actions]

Triggered Tuva CI with all: dbt run (ref: main).