examples: 5 hand-curated fixtures + parametrized regression suite

tests/fixtures/reddit/example_004.json

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+{
+  "post": {
+    "reddit_id": "fx004",
+    "source_sub": "EuropeFIRE",
+    "url": "https://reddit.com/fx004",
+    "title": "FIRE'd at 41 in Lisbon, Portugal",
+    "body": "Portfolio €1.05M, mostly accumulating VWCE. Retired 6 months ago. Wife and two kids — family of 4. Spending €38k/yr in Lisbon (Portugal), including rent. NHR visa locked in.",
+    "created_at": "2026-04-20"
+  },
+  "expected": {
+    "country": "Portugal",
+    "city": "Lisbon",
+    "portfolio_native": 1050000,
+    "annual_exp_native": 38000,
+    "raw_currency": "EUR",
+    "age": 41,
+    "family_size": 4,
+    "fi_status": "FIRE",
+    "is_retired": true
+  }
+}