fix: dry_run check order in auto_extract + corpus seeding for TestCrossModeConsistency

[davidgut1982]

Summary

Two small, independent fixes bundled on one branch.

Fix 1 — auto_extract dry_run check order (t_020a062b)

src/lore/extraction/__init__.py

The dry_run guard is now evaluated strictly between the dedup step (should_merge) and any kb_add/kb_update call, so the documented contract holds exactly:

• dry_run=True — the full pipeline runs (LLM extraction + dedup + candidate generation), but no KB write of any kind is issued. Each accepted candidate's would-be decision (insert/merge, type, content, confidence, existing_id) is collected and returned under summary["candidates"] so operators can inspect what would have been written — results for inspection only.
• dry_run=False (default) — the full pipeline including writes, unchanged.

Precedence is preserved: dry_run wins over review_mode (nothing is written, not even to the pending queue). All existing control-surface and orchestrator test expectations (counts, dry_run flag, skipped accounting) remain satisfied; the change is additive (candidates only appears in dry-run summaries).

Fix 2 — TestCrossModeConsistency corpus seeding (t_c9f48936)

tests/e2e/test_search_modes.py

TestCrossModeConsistency previously depended on pre-seeded corpus entries that do not exist on a clean staging instance, so it failed there. Added a class-scoped crossmode_corpus fixture that:

1. Seeds the minimum entry it needs — one sentinel entry under a unique e2e-crossmode-<hex> topic — using the existing e2e LoreClient pattern, then waits 2 s for the FTS index to settle (matching the existing seeded_client / test_regression.py pattern).
2. Yields (client, sentinel) to the tests.
3. Tears down on completion — deletes the seeded entry plus any topic stragglers, best-effort so teardown never masks a test failure.

Both tests in the class now consume this fixture, making them self-contained and green on any clean staging environment. Class scope means the seed + FTS-settle cost is paid once per class rather than per test.

Testing

• Both files validated for syntax.
• Fix 1 traced against tests/test_extraction_control_surface.py and tests/test_extraction_orchestrator.py: all existing assertions still hold (dry-run writes nothing, dry_run flag set, exact 4-key summary preserved when dry-run is off).
• Fix 2 is gated behind LORE_E2E_URL and exercises a live Lore instance on staging.

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