split nimmerworld architecture: phase 1 of 3 — vertical-by-domain directories Create 9 domain directories under nimmerworld/, each owning an architecture.md that will eventually sit alongside server/client/schema/test code for that domain (vertical-by-domain rather than horizontal-by-language).

inference-and-memory/architecture.md

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+# Inference and Memory
+
+> *AI substrate + memory: LLM tiering by role (Theia-tier / teacher-tier / driver-tier with trait-LoRAs); three rings of inference (A=local, B=our-farm, C=external-providers, with cloud-LoRA-backup as Ring-A revenue and BYOK adapter for Ring-C); custom nimmerworld-base-model with default-opt-out + rewarded-opt-in data-sharing tiers; runtime sampling knobs as per-turn director-controlled levers; per-player local memory architecture (primary.sqlite + fallback.sqlite + clasp.sqlite + embedding-beside) with memory-classes (cornerstone/birthright/working/volatile) and trait-graded importance; three-tier knowledge stack (world / district / primary [+ clasp if in-between]) with paced canon-propagation.*
+>
+> ***Status: skeleton — content migration scheduled for commit 2 of the split-into-domains operation. Architecture content currently lives in `architecture-broad.md` and will land here next.***
+>
+> *Companion to: `architecture-broad.md` (executive summary + global meta-lists), `narrative-composition/architecture.md` (Compositor canon-fragments land in primary.sqlite via UID-keyed routing), `player-experience/architecture.md` (Ring-A/B/C choice + voice-as-biometric-local + universal-translator state), `runtime-engine/architecture.md` (driver-tier LLM fires at slot-fire).*
+
+## Sections that will land here
+
+- §LLM tiering, voice fidelity, and the three rings of inference
+- §Runtime sampling knobs
+- §Local memory architecture (player-side)
+
+---
+
+**Version:** 0.7.0-skeleton | **Created:** 2026-04-26 | **Updated:** 2026-04-26 | **Origin:** Skeleton placeholder for commit 1 of the split-into-domains operation