Rewrite ecc-setup-guide.md for ECC v2.0.0: the new `ecc` selective-install
CLI (profiles, auto-update, doctor/repair/plan/catalog/consult), the
skills/ecc + rules/ecc namespaced layout, updated install/model-tier and
Continuous-Learning-v2 sections, and the `--dry-run auto-update` footgun
(it performs a real install). Note 2 of 3 Windows CL-v2 bugs are now fixed
upstream.
Index the guide in README.md and bump the Last updated date.
Three silent-failure bugs: python3 Store stub, claude-vscode entrypoint
rejected, observer disabled by default. All must be fixed for observations
to flow.
alexei.dolgolyov