test: add golden output parity gate and live A/B compare

Phase 0 of docs/DESIGN.md, before any refactor code:

- tests/golden.rs runs every case in tests/golden/cases.toml (126
  outputs across help, completions, config, cache, all stocks commands
  on MSN and Yahoo mocks, error paths, and ownership queries on a seeded
  fixture DB) and compares exit code, stdout, and stderr byte for byte.
  Regenerate only with UPDATE_GOLDEN=1 for a reviewed output change.
- scripts/live-smoke.sh --compare <old-idx> runs each live case with
  both binaries and fails on differing exit codes, added/missing/retyped
  JSON keys, or changed values for slow-moving data.
- Exclude golden files from the whitespace/EOF pre-commit fixers, which
  would otherwise rewrite pinned help output.

Both gates were fault-injected: a one-word table change fails exactly
the three history goldens, and a binary dropping profile.long_name fails
only the profile live comparison.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/golden/ownership-cross-holders.json.golden

@@ -0,0 +1,175 @@
+exit: 0
+--- stdout
+[
+  {
+    "entity": {
+      "id": 11,
+      "canonical_name": "ASTRA INTERNATIONAL",
+      "entity_type": null,
+      "country": null
+    },
+    "ticker_count": 1,
+    "total_bps": 7968
+  },
+  {
+    "entity": {
+      "id": 14,
+      "canonical_name": "DWIMURIA INVESTAMA ANDALAN",
+      "entity_type": null,
+      "country": null
+    },
+    "ticker_count": 1,
+    "total_bps": 5494
+  },
+  {
+    "entity": {
+      "id": 4,
+      "canonical_name": "ADARO STRATEGIC INVESTMENTS",
+      "entity_type": null,
+      "country": null
+    },
+    "ticker_count": 1,
+    "total_bps": 4110
+  },
+  {
+    "entity": {
+      "id": 5,
+      "canonical_name": "ALAMTRI RESOURCES INDONESIA TBK PT",
+      "entity_type": null,
+      "country": null
+    },
+    "ticker_count": 1,
+    "total_bps": 1537
+  },
+  {
+    "entity": {
+      "id": 7,
+      "canonical_name": "GARIBALDI THOHIR",
+      "entity_type": null,
+      "country": null
+    },
+    "ticker_count": 1,
+    "total_bps": 583
+  },
+  {
+    "entity": {
+      "id": 2,
+      "canonical_name": "SARATOGA INVESTAMA SEDAYA",
+      "entity_type": null,
+      "country": null
+    },
+    "ticker_count": 1,
+    "total_bps": 438
+  },
+  {
+    "entity": {
+      "id": 9,
+      "canonical_name": "EDWIN SOERYADJAYA",
+      "entity_type": null,
+      "country": null
+    },
+    "ticker_count": 1,
+    "total_bps": 352
+  },
+  {
+    "entity": {
+      "id": 8,
+      "canonical_name": "IR. T. PERMADI RACHMAT",
+      "entity_type": null,
+      "country": null
+    },
+    "ticker_count": 1,
+    "total_bps": 348
+  },
+  {
+    "entity": {
+      "id": 13,
+      "canonical_name": "YAYASAN ABDI BANGSA",
+      "entity_type": null,
+      "country": null
+    },
+    "ticker_count": 1,
+    "total_bps": 283
+  },
+  {
+    "entity": {
+      "id": 10,
+      "canonical_name": "SANDIAGA SALAHUDDIN UNO",
+      "entity_type": null,
+      "country": null
+    },
+    "ticker_count": 1,
+    "total_bps": 204
+  },
+  {
+    "entity": {
+      "id": 1,
+      "canonical_name": "PERSADA CAPITAL INVESTAMA",
+      "entity_type": null,
+      "country": null
+    },
+    "ticker_count": 1,
+    "total_bps": 154
+  },
+  {
+    "entity": {
+      "id": 12,
+      "canonical_name": "YAYASAN BINA SEJAHTERA WARGA BULOG",
+      "entity_type": null,
+      "country": null
+    },
+    "ticker_count": 1,
+    "total_bps": 135
+  },
+  {
+    "entity": {
+      "id": 6,
+      "canonical_name": "FTAG INVESTMENT BANK",
+      "entity_type": null,
+      "country": null
+    },
+    "ticker_count": 1,
+    "total_bps": 129
+  },
+  {
+    "entity": {
+      "id": 17,
+      "canonical_name": "ANTHONI SALIM",
+      "entity_type": null,
+      "country": null
+    },
+    "ticker_count": 1,
+    "total_bps": 115
+  },
+  {
+    "entity": {
+      "id": 3,
+      "canonical_name": "TRINUGRAHA THOHIR",
+      "entity_type": null,
+      "country": null
+    },
+    "ticker_count": 1,
+    "total_bps": 115
+  },
+  {
+    "entity": {
+      "id": 16,
+      "canonical_name": "TRICIPTA MANDHALA GUMILANG",
+      "entity_type": null,
+      "country": null
+    },
+    "ticker_count": 1,
+    "total_bps": 107
+  },
+  {
+    "entity": {
+      "id": 15,
+      "canonical_name": "CATURGUWIRATNA SUMAPALA",
+      "entity_type": null,
+      "country": null
+    },
+    "ticker_count": 1,
+    "total_bps": 102
+  }
+]
+--- stderr