fix: restore Global Ask worker capabilities

[seonghobae]

Summary

• restore semantic query and opt-in public-claim verification factories in the dedicated Global Ask worker
• make the real API fixture apply the concurrent evidence-search migration through the same psql -X -v ON_ERROR_STOP=1 -f boundary as production
• restore migration constants lost during the Dashboard stack merge and run settlement-dependent verification through the worker fixture
• refresh the Dashboard gap baseline to protected main ff7431bd, feat(dashboard): quantify cases and preserve project journeys #640 5594029c, and this follow-up

Verification

• uv run --frozen --extra dev --extra backend python -m pytest -q tests/test_backend_worker_process.py tests/test_contextual_orchestrator_vision.py tests/test_observability.py tests/test_ontology.py (46 passed)
• uv run --frozen --extra dev --extra backend python -m pytest -q backend/tests/test_api.py::test_ask_public_verification_is_opt_in_and_separate_from_post_citations (1 passed with live Keycloak/PostgreSQL)
• uv run --frozen --extra dev python -m pytest -q tests/test_documentation_hygiene.py (6 passed)
• uv run --frozen --extra dev --extra backend python -m pytest -q backend/tests/test_api.py::test_seed_fixture_summaries_surface_on_get_summary backend/tests/test_api.py::test_persisted_chat_is_returned_without_an_llm (2 passed; the earlier shared-Keycloak timeout did not reproduce)
• broader run reached 1451 passed, 11 skipped before exposing the now-repaired fixture constants; a subsequent API-file run was interrupted after the shared Keycloak stopped responding, so this is not claimed as full-suite success

Exact diff from #640 current branch contains only the worker, its real API fixture/regression, and the requested evidence baseline. No provider selection, heuristic, or local measurement implementation is added.

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[devin-ai-integration]

Devin Review found 2 potential issues.