kb: retire pi-installation association (OMP is the primary harness)

Purge live-state claims that ~/.pi is our harness; keep general
pi documentation in omp-docs/ and dated historical records.

- README.md: single config source; Legacy Notes reworded
- AGENTS.md: drop 'like ~/.pi did' framing
- APPEND_SYSTEM.md: okf-spec -> omp-docs/references/okf-spec.md
- dotfiles/zsh/.zshrc: systemprompt alias -> APPEND_SYSTEM.md
- managed skill llm-fleet-model-swap + model_config_sync skill:
  single-source models.yml; validation script YAML-only
- memories (MEMORY.md, memory_summary.md, learned.md): single source
- omp-docs: .okf root -> ~/.omp/omp-docs; de-live pi-era claims in
  pi/index.md, pi-web-access.md, engineering/agents-files.md

agent/memories/--home-dank-.omp--/MEMORY.md

@@ -20,7 +20,7 @@
 - **OS/Kernel**: CachyOS Linux 7.2.0-1. Fixed `nvidia-modeset` semaphore deadlock blocking `niri` (GUI freeze/VT down) via `/etc/modprobe.d/nvidia-workarounds.conf` + rebuilt initramfs (`mkinitcpio -P`) + force-reboot.
 
 ## AI Agent & Model Configuration
-- **Config Files**: Source of truth `~/.pi/agent/models.json` ↔ `~/.omp/agent/models.yml` (imported/generated). Edit both in lock-step unless using dedicated import.
+- **Config Files**: `~/.omp/agent/models.yml` is the single source of truth (OMP is the primary harness; the pi-era dual-copy convention is retired).
 - **Context Sizing**: Uses Ki-style multiples (`163840` = 160×1024). "200k" → `204800`. Update `contextWindow` and `maxTokens` together for `frank-default-small`.
 - **Providers & Models**:
   - `llamacpp (dankserver)` @ `http://192.168.0.235:7770/v1`: `frank-default-small` (Ornith-1.5-35B-A3B CRACK Q6_K, ngram-mod, reasoning true). Context: 204800.