Fix Zot paths in Technical Decisions section

Update to match Phase 0 details:
- Built from source, not homebrew
- Config at ~/.config/zot/config.json
- Data at ~/zot/
- Binary path documented

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/k8s-migration.md

@@ -31,8 +31,10 @@ This plan details a phased migration of blumeops services from direct hosting on
 ### Container Registry: Zot
 - OCI-native, lightweight
 - Native support for proxying multiple registries (Docker Hub, GHCR, Quay)
-- Single binary, ARM64 native
-- Config at `/etc/zot/config.json`
+- Built from source at `~/code/3rd/zot` (not in homebrew)
+- Binary: `~/code/3rd/zot/bin/zot-darwin-arm64`
+- Config: `~/.config/zot/config.json`
+- Data: `~/zot/`
 
 ### Minikube Driver: Podman
 - Rootless containers for better security