feat(content): POC deserter origin + world fixtures with id-resolution check

content/world/items/coin.json

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+{ "id": "coin", "name": "coin", "slot": "currency" }

content/world/items/worn_shortsword.json

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+{ "id": "worn_shortsword", "name": "a worn shortsword", "slot": "weapon" }

content/world/locations/greywater_docks.json

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+{ "id": "greywater_docks", "name": "the Greywater docks",
+  "description": "A rot-black wharf where the river meets the sea trade." }

content/world/npcs/brannoc_thane.json

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+{ "id": "brannoc_thane", "name": "Brannoc Thane", "role": "companion",
+  "persona": "Dry, warm, economical. Twenty years past his prime and at peace with it.",
+  "knowledge": [] }

content/world/npcs/cadwyn_vell.json

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+{ "id": "cadwyn_vell", "name": "Cadwyn Vell", "role": "companion",
+  "persona": "Florid when performing, clipped when scared. A fine musician and a finer liar.",
+  "knowledge": [] }

content/world/quests/find_the_ledger.json

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+{ "id": "find_the_ledger", "name": "The Missing Ledger",
+  "objective": "Find who took Fenn's ledger" }