examples: 5 hand-curated fixtures + parametrized regression suite

tests/fixtures/reddit/example_001.json

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+{
+  "post": {
+    "reddit_id": "fx001",
+    "source_sub": "ExpatFIRE",
+    "url": "https://reddit.com/fx001",
+    "title": "Pulled the trigger — FIRE'd in Manila at 38",
+    "body": "Net worth $1.2M, wife + 1 kid, USD-denominated assets in VTI/BND. Expecting to spend ~$24k/yr. Retired last September.",
+    "created_at": "2026-01-15"
+  },
+  "expected": {
+    "country": "Philippines",
+    "city": "Manila",
+    "portfolio_native": 1200000,
+    "annual_exp_native": 24000,
+    "raw_currency": "USD",
+    "age": 38,
+    "family_size": 3,
+    "fi_status": "FIRE",
+    "is_retired": true
+  }
+}