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--/skills/model_config_sync/scripts/validate_model_config.sh

@@ -1,9 +1,10 @@
 #!/bin/bash
-# Validate both JSON and YAML context/tokens match
-JSON_VAL=$(jq -e '.providers."llamacpp (dankserver)".models[0] | .contextWindow, .maxTokens' ~/.pi/agent/models.json)
-YAML_VAL=$(python3 -c "import yaml; d=yaml.safe_load(open('/home/dank/.omp/agent/models.yml')); m=d['providers']['llamacpp (dankserver)']['models'][0]; print(m['id'], m['contextWindow'], m['maxTokens'])")
-if [ "$JSON_VAL" = "$YAML_VAL" ]; then
-  echo "Config in sync: $JSON_VAL"
+# Validate the OMP model config (single source of truth) parses and reports
+# the dankserver model's context/tokens.
+YAML_VAL=$(python3 -c "import yaml; d=yaml.safe_load(open('$HOME/.omp/agent/models.yml')); m=d['providers']['llamacpp (dankserver)']['models'][0]; print(m['id'], m['contextWindow'], m['maxTokens'])")
+if [ -n "$YAML_VAL" ]; then
+  echo "Config OK: $YAML_VAL"
 else
-  echo "Mismatch detected. JSON: $JSON_VAL | YAML: $YAML_VAL"
+  echo "YAML parse failed or model missing."
+  exit 1
 fi