feat(campaigns): separate GM truth from PC knowledge

Hidden truth lives in gm/; state/knowledge.md holds what the PC knows, believes, and suspects. Everything else in a campaign stays player-facing.
2026-09-13 16:50:18 +08:00
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+# Retcons
+
+A log of facts changed after the fact. Each entry records what changed and why,
+so the change is not quietly contradicted later.
+
+A retcon is only allowed in the layer the PC has not perceived: every session
+log entry and every line of `../state/knowledge.md` must still read exactly as
+before. See `README.md`.
+
+| Session | What changed | Why |
+|---------|--------------|-----|
+|         |              |     |