examples: 5 hand-curated fixtures + parametrized regression suite

tests/fixtures/reddit/example_003.json

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+{
+  "post": {
+    "reddit_id": "fx003",
+    "source_sub": "coastFIRE",
+    "url": "https://reddit.com/fx003",
+    "title": "Coasting in Bali — $850k portfolio, still working remote",
+    "body": "Hit my coast number at 35: $850k invested, expecting to grow to FIRE by 50 without contributing. Living in Ubud, Indonesia with my partner. Spending around $30k/yr between us. Working remote part-time for fun.",
+    "created_at": "2026-03-05"
+  },
+  "expected": {
+    "country": "Indonesia",
+    "city": "Bali",
+    "portfolio_native": 850000,
+    "annual_exp_native": 30000,
+    "raw_currency": "USD",
+    "age": 35,
+    "family_size": 2,
+    "fi_status": "coastFIRE",
+    "is_retired": false
+  }
+}