Refactor project structure and update documentation

- Migrated data files to 'data/collection/' and 'data/decks/'.
- Moved 'card_cache.json' to 'cache/'.
- Reorganized 'collection_hydrated/' and 'deck_analysis.json' into 'output/'.
- Updated 'hydrate.py' and script defaults to match the new paths.
- Updated 'README.template.md' and 'AGENTS.template.md' templates.
- Regenerated 'README.md' and 'AGENTS.md'.

output/hydrated/planeswalkers.json

@@ -0,0 +1,40 @@
+[
+  {
+    "scryfall_uri": "https://scryfall.com/card/eld/191/garruk-cursed-huntsman?utm_source=api",
+    "name": "Garruk, Cursed Huntsman",
+    "mana_cost": "{4}{B}{G}",
+    "cmc": 6.0,
+    "colors": [
+      "B",
+      "G"
+    ],
+    "color_identity": [
+      "B",
+      "G"
+    ],
+    "type_line": "Legendary Planeswalker \u2014 Garruk",
+    "oracle_text": "0: Create two 2/2 black and green Wolf creature tokens with \"When this token dies, put a loyalty counter on each Garruk you control.\"\n\u22123: Destroy target creature. Draw a card.\n\u22126: You get an emblem with \"Creatures you control get +3/+3 and have trample.\"",
+    "power": null,
+    "toughness": null,
+    "loyalty": "5",
+    "count": 1
+  },
+  {
+    "scryfall_uri": "https://scryfall.com/card/tdm/11/elspeth-storm-slayer?utm_source=api",
+    "name": "Elspeth, Storm Slayer",
+    "mana_cost": "{3}{W}{W}",
+    "cmc": 5.0,
+    "colors": [
+      "W"
+    ],
+    "color_identity": [
+      "W"
+    ],
+    "type_line": "Legendary Planeswalker \u2014 Elspeth",
+    "oracle_text": "If one or more tokens would be created under your control, twice that many of those tokens are created instead.\n+1: Create a 1/1 white Soldier creature token.\n0: Put a +1/+1 counter on each creature you control. Those creatures gain flying until your next turn.\n\u22123: Destroy target creature an opponent controls with mana value 3 or greater.",
+    "power": null,
+    "toughness": null,
+    "loyalty": "5",
+    "count": 1
+  }
+]