Story: Add compass test run: build and run unit tests via compass

Running tests today means knowing the cmake target zoo (rat, test_<component>.tests) and, for direct binary runs, hand-loading the .env test environment. Compass already owns test-result inspection (compass test results) and test logging (compass test logging); this story completes the pillar with compass test run.

Use cases:

1. Run all tests — compass test run → delegates to the rat target.
2. Run a composite component's tests — compass test run refdata → discovers and runs every test target under the component (ores.refdata.api.tests, ores.refdata.core.tests, …).
3. Run a specific component's tests — compass test run refdata.core → the test_ores.refdata.core.tests cmake target.
4. Filter by Catch2 name or tag — compass test run refdata.core --filter "[repository]" (or a test name) → compass invokes the test binary directly, loading .env into the process environment first.
5. Build first — --build builds the relevant targets before running; compass just calls cmake (no parallel build logic of its own).

The preset comes from ORES_PRESET in .env (as compass test results already does), overridable with --preset.

• compass test run runs the full suite via the rat target.
• compass test run <component> runs all of a composite component's test targets; compass test run <component>.<part> runs one.
• --filter <name-or-tag> passes a Catch2 filter to the test binary, with .env loaded into its environment.
• --build builds the targets first by calling cmake; without it, existing binaries are used as-is.
• --preset overrides the ORES_PRESET default from .env.
• compass test results picks up the run's XML output unchanged.
• The run-the-tests recipe is updated to lead with the compass command (and its stale -DORES_TEST_LOG_LEVEL / parse_test_results.py references are fixed).

• CI integration — CI keeps calling cmake targets directly.
• Test sharding/parallelism beyond what ctest already provides.

Originally the sprint-19 story of the same UUID, abandoned at sprint close and carried to the backlog inbox; re-promoted 2026-06-06 with goal, acceptance and out-of-scope lifted back into the live sections verbatim.