fix(torghut): bound loop status postgres reads

[gregkonush]

Summary

• add concurrent, time-first PostgreSQL indexes for the three loop-status reads that exceeded the production 1500 ms statement timeout
• repair interrupted invalid concurrent-index residues before rebuilding while leaving valid indexes untouched
• cover revision behavior, realistic PostgreSQL 18 plans and timeouts, symmetric downgrade, and required CI wiring

Related Issues

None

Testing

• uv sync --frozen --extra dev
• uv run --frozen pytest -q tests/test_loop_status_read_indexes_migration.py (7 passed)
• TORGHUT_TEST_POSTGRES_DSN=postgresql+psycopg://torghut:torghut@127.0.0.1:55432/torghut_test uv run --frozen pytest -q tests/execution/test_loop_status_read_indexes_postgres.py against postgres:18-trixie (1 passed)
• uv run --frozen python scripts/check_migration_graph.py
• uv run --frozen ruff format --check migrations/versions/0062_loop_status_read_indexes.py tests/test_loop_status_read_indexes_migration.py tests/execution/test_loop_status_read_indexes_postgres.py
• uv run --frozen ruff check migrations/versions/0062_loop_status_read_indexes.py tests/test_loop_status_read_indexes_migration.py tests/execution/test_loop_status_read_indexes_postgres.py
• uv run --frozen ruff check migrations/versions/0062_loop_status_read_indexes.py tests/test_loop_status_read_indexes_migration.py tests/execution/test_loop_status_read_indexes_postgres.py --select F401 --preview
• uv run --frozen pyright --project pyrightconfig.json
• uv run --frozen pyright --project pyrightconfig.alpha.json
• uv run --frozen pyright --project pyrightconfig.scripts.json
• uv run --frozen python scripts/run_pylint_torghut_quality_diff_gate.py --base origin/main migrations/versions/0062_loop_status_read_indexes.py tests/test_loop_status_read_indexes_migration.py tests/execution/test_loop_status_read_indexes_postgres.py
• uv run --frozen python scripts/run_pylint_torghut_file_length_gate.py --base origin/main migrations/versions/0062_loop_status_read_indexes.py tests/test_loop_status_read_indexes_migration.py tests/execution/test_loop_status_read_indexes_postgres.py
• uv run --frozen python scripts/measure_torghut_tech_debt.py --baseline config/quality/tech-debt-baseline.json --enforce-ratchet --format markdown
• bun test packages/scripts/src/torghut/__tests__/build-push-workflow.test.ts (22 passed)

Screenshots (if applicable)

N/A; this is a PostgreSQL migration and CI-only change.

Breaking Changes

None. Alembic applies revision 0062_loop_status_read_indexes after 0061_linked_submission_terminal; index creation and removal use PostgreSQL concurrent operations.

Checklist

• Testing section documents the exact validation performed (or N/A with justification).
• Screenshots and Breaking Changes sections are handled appropriately (removed or filled in).
• Documentation, release notes, and follow-ups are updated or tracked. No separate documentation or release-note update is required for this narrow operational migration.

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[gregkonush]