feat: align LegacyHUB with TeamHUB platform contract (D2/D4, assets, security)

Close 12 audit-driven platform-compliance gaps on a single branch.

- D4 dispatch: app/integrations/dispatch_client.py participant `legacyhub`,
  emits LegacyhubDocumentIndexed + AssetDerivativeReady after the indexing
  commit (idempotent uuid5), http_inbox route (reindex/tombstone) with
  audit-based dedupe; docs/dispatch-contract.md. Celery+Redis stays intra-module.
- D2 SSO: app/integrations/identity.py validates X-TeamHub-* + role/scope
  mapper; security.py adds trusted-header enforcement (AUTH_REQUIRE_IDENTITY)
  and a scope check on /search; docker-compose.teamhub.yml (external teamhub_net
  + internal db net, api not host-published); RUNBOOK network/firewall section.
- Asset standard: SearchHit/Citation carry asset_id/owner_module; buckets
  renamed teamhub-legacyhub-* (+quarantine/tmp/exports); purge-by-asset_id with
  legal-hold guard (app/indexing/projection.py); OCR-markdown derivative event.
- audit_log model + Alembic 0003 + record_audit on writes (same transaction).
- Secret masking: app/common/json_logger.py recursive mask wired into structlog
  (+ensure_ascii=False); event payloads redacted before persistence.
- Service X-API-Key mandatory on ingest endpoints (defence-in-depth).
- Port: host API 8000->8050 (collision with SalesHUB/MailHUB resolved),
  container still listens on 8000.
- Config: no plaintext secret defaults; fail-loud in non-dev (no value leak).
- Docs drift: README PG 5440, layered-auth note, 5173 removed from CORS;
  ingest/folder gated by ENABLE_FOLDER_INGEST (410 by default).
- ADRs: layers mapping, shared-core extraction, UI locale (RU-first).

Tests: 78 passing (ruff, compileall, pytest, tsc, vite build, compose config).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/test_json_logger.py

@@ -0,0 +1,73 @@
+"""Tests for the secret-masking JSON logger (obs-core)."""
+
+from __future__ import annotations
+
+from app.common.json_logger import (
+    MASK,
+    build_event,
+    is_sensitive_key,
+    mask_sensitive,
+    redact_secrets,
+)
+
+
+def test_flat_secret_keys_are_masked():
+    out = redact_secrets(
+        {
+            "api_key": "super-secret",
+            "authorization": "Bearer abc",
+            "password": "hunter2",
+            "x_api_key": "k",
+        }
+    )
+    assert out == {
+        "api_key": MASK,
+        "authorization": MASK,
+        "password": MASK,
+        "x_api_key": MASK,
+    }
+
+
+def test_nested_storage_kms_key_is_masked():
+    out = redact_secrets(
+        {
+            "asset_id": "asset_123",
+            "storage": {"bucket": "b", "object_key": "k", "kms_key_id": "arn:aws:kms:secret"},
+        }
+    )
+    assert out["asset_id"] == "asset_123"
+    assert out["storage"]["bucket"] == "b"
+    assert out["storage"]["object_key"] == "k"  # neutral key NOT masked
+    assert out["storage"]["kms_key_id"] == MASK
+
+
+def test_neutral_keys_are_not_masked():
+    for key in ("object_key", "idempotency_key", "storage_key", "asset_id", "owner_module"):
+        assert is_sensitive_key(key) is False
+    assert redact_secrets({"object_key": "x"}) == {"object_key": "x"}
+
+
+def test_secret_keys_are_detected():
+    for key in ("api_key", "x-api-key", "qdrant_api_key", "kms_key_id", "password", "authorization"):
+        assert is_sensitive_key(key) is True
+
+
+def test_list_values_are_recursed():
+    out = redact_secrets({"items": [{"token": "t"}, {"name": "ok"}]})
+    assert out["items"][0]["token"] == MASK
+    assert out["items"][1]["name"] == "ok"
+
+
+def test_mask_sensitive_processor_signature():
+    event = {"event": "x.y", "api_key": "leak", "user": "u"}
+    masked = mask_sensitive(None, "info", event)
+    assert masked["api_key"] == MASK
+    assert masked["event"] == "x.y"
+    assert masked["user"] == "u"
+
+
+def test_build_event_returns_masked_payload():
+    payload = build_event("ingest", "doc.indexed", level="info", api_key="leak", asset_id="a1")
+    assert payload["api_key"] == MASK
+    assert payload["asset_id"] == "a1"
+    assert payload["event"] == "doc.indexed"