feat(ui): Explorer interactivity — Model Runs & Jobs detail views, comparison, verify, sorting (PRP-21)

[w7-mgfcode]

Summary

Implements PRP-21 — extends the Model Runs and Jobs Explorer pages
from flat, read-only tables into an interactive investigation surface, the
direct sibling of PRP-20 (#187) applied to the registry and jobs slices.

Closes #189.

Backend (additive — no migration, no new slice, no app/main.py change)

• GET /registry/runs gains optional sort_by + sort_order query params.
• GET /jobs gains the identical params.
• Both resolve sort_by through an allow-list dict to a real mapped column
  (security-patterns.md — never raw SQL); an unknown sort_by falls back to
  the prior created_at desc default rather than erroring; sort_order outside
  {asc,desc} is rejected 422 via the Query regex.

Frontend

• Three new deep-linkable routes: /explorer/runs/:runId,
  /explorer/jobs/:jobId, /explorer/runs/compare?a=&b=.
• Run detail — profile, JSON config/metrics/runtime info, store/product
  cross-links, and a SHA-256 artifact "Verify integrity" action.
• Job detail — profile, params/result JSON, error details, linked run, cancel
  action; live-polls while running.
• Run comparison — two run pickers, side-by-side profile, config_diff, and
  metrics_diff with neutral ▲/▼ delta indicators.
• Both tables — server-side column sorting, row-click navigation, and
  URL-persisted filter/sort/page state; the Jobs table also gains CSV export +
  column-visibility (Runs already had them).
• New: useVerifyArtifact hook, JsonBlock component, ArtifactVerifyResponse
  type; sortBy/sortOrder threaded into useRuns/useJobs.

Tests

• New registry integration tests for sort + unknown-fallback + 422.
• New jobs DB test infrastructure (db_session/client/sample_jobs_multi)
  and a first jobs/tests/test_routes.py — closes the jobs slice's route-test gap.

Validation

• ruff check / ruff format --check / mypy --strict / pyright --strict — clean.
• pytest -m "not integration" — 1101 passed.
• Registry + jobs integration sort tests — 15 new tests pass.
• tsc --noEmit / eslint / vitest — clean (27 frontend tests pass).
• Dogfooded in a real browser — 15/15 UI scenarios pass, zero console errors
  (run/job detail, verify, compare, sorting, URL round-trip).

Notes

• No Alembic migration — sorting is a read-only ORDER BY change.
• The pre-existing test_list_runs_empty integration test assumes an empty DB
  and fails on a stale local Postgres with leftover demo runs; it passes on the
  fresh DB CI provisions. Unrelated to this PR.

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