feat: dominium standalone — simulador de campo medio sobre Llimphi

Front-door publicable de dominium: los 9 crates propios como path
members; Llimphi, app-bus, rimay-localize, wawa-config y pluma-notebook
por git-dep al monorepo tawasuyu.git (branch=main). cargo check
--workspace --all-targets pasa exit 0.

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

01_yachay/dominium/dominium-physics/README.md

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+# dominium-physics
+
+> Deterministic 6-phase tick for [dominium](../README.md).
+
+Each `tick()` runs 6 phases in fixed order:
+
+1. **Diffusion** of layers (`materia`, `psique`, `poder`).
+2. **Exponential decay** per layer.
+3. **Endogenous ψ↔action coupling** (Phase A): the `psique` field modulates agent decision bias, and agent action injects back into `psique`.
+4. **Concepts**: active emitters inject/drain layers based on their radius + mods.
+5. **Agents**: decision + execution of the 6 atomic actions.
+6. **Invariants**: final validation (mass conserved, non-negative layers).
+
+## API
+
+```rust
+use dominium_physics::tick;
+
+tick(&mut world);
+```
+
+## Deps
+
+- [`dominium-core`](../dominium-core/README.md)
+- `libm`