docs: canon log schema + origin seed design

Design spec for the §11 canon log, plus origin seeds as thin initial-state
overlays over a single static world. Three layers (world content / origin seed /
runtime canon log), the in/out boundary (numeric Luck never enters the AI
payload, §7), field-level schemas, new-game construction order, turn-to-turn
maintenance, and JSON storage validated on both client and api.

Folds content/npcs and content/quests under content/world/; adds
content/world/{locations,items} and content/origins. fallback/ kept outside
world/ (authored prose, not id-referenced).

Spec: docs/superpowers/specs/2026-07-09-canon-log-schema-design.md

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

content/world/README.md

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+# /content/world — static, ID-referenced content
+
+The shared world. Authored once, identical every playthrough. Everything here
+carries a stable string **id** that origins and the canon log reference. Never
+seed initial *state* here — that is an origin's job (`/content/origins`).
+
+```
+/locations   Towns, dungeons, points of interest. id → location
+/npcs        Persona + knowledge lists (charter §6). id → npc
+/quests      Story skeletons and quest definitions (charter §17). id → quest
+/items       Gear, consumables, cursed items (charter §7). id → item
+```
+
+New-game construction resolves every id an origin references (start location,
+start quest, granted items, seeded companions) against this content, and fails
+loudly if one is missing. Keep ids stable — a rename is a breaking change.

content/world/items/README.md

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+# /content/world/items
+
+Item definitions — gear, consumables, cursed items — each with a stable **id**.
+An origin's `inventory_grants` resolves item ids here.
+
+Cursed/blessed items move Luck (charter §7): *a cursed blade granting +4 STR and
+−5 LCK is the most interesting item in this game.* The item system supports the
+STR/LCK split on day one. Numeric effects live in game state; only narrative-worthy
+items surface as canon-log facts.

content/world/locations/README.md

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+# /content/world/locations
+
+The map — towns, dungeons, points of interest, each with a stable **id**. An
+origin's `start_location_id` resolves here; the canon log's `location` mirrors
+the current one (id + display name).
+
+POC scope (§17): one town, one dungeon (three fights, one boss). One reusable
+world; origins vary only where the player begins within it.

content/world/npcs/README.md

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+# /content/npcs
+
+Per-NPC knowledge lists — an explicit list of what each NPC knows (charter §6). This is the *entire content* the NPC has to draw on, injected as `knowledge: [...]`. Not a prompt suggestion — the whole design.
+
+POC scope (§17): **two NPCs** with authored knowledge lists.
+
+Companions (Cadwyn, Brannoc) are voiced too but carry more (approval, humiliation log) — see charter §9.

content/world/quests/README.md

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+# /content/quests
+
+Authored story skeletons and quest definitions. The *skeleton* is authored; the *prose* is generated (charter §1).
+
+POC scope (§17): one town, one dungeon (three fights, one boss). AI-generated story skeletons are v2 — out of scope.