refactor: move runtime capture, history and orchestration logic to Rust

[kvlonge]

Why

Runtime and orchestration logic was exempt from the Rust move because it lived next to user-code or executor code; only the user-code shims, capture glue, public facades and third-party glue should stay Python.

Changes

• Native compute log storage, command-output capture dispatcher, and SQLite and Postgres execution history backends; tees, logging handlers, public facades and driver glue stay Python.
• Native dbt subprocess runner, JSON event stream, project init and profile/project validation; PyYAML parsing stays Python.
• Native custom-rule orchestration: parallel phases, host dispatch and splitting, result cache, cancellation and CPU count. User rules still run only in the Python host; interrupting a split run now stops every host.
• Native compile timings, built-in audit templates and loaded-code identity.
• Multi-host coverage restored, including interrupt, payload publish failures and host fact equivalence.

Verification

• 11,385 unit/integration tests passed; make check-ci passed with all optional dependencies available.
• Compiler differential: 371 projects, unchanged goldens. Planner differential: 11 projects matched the main baseline.
• Compile outputs and exit codes match the reference on synthetic and private compile-only projects.
• Old and new history backends read each other's databases; compute logs, output capture, rule outputs and dbt output matched recorded captures.
• Independent review: no correctness findings.