refactor(dev): remove in-repo helm charts and e2e test harness

Michael Angelo Riverarequested to merge
remove-helm-and-e2e into main

Summary

  • Remove the vendored helm chart (helm/), local K8s observability manifests, and all E2E test infrastructure
  • Remove crates/xtask/src/e2e/ (22 files), e2e/ directory (10 files), config/e2e.yaml, docs/dev/e2e.md
  • Remove e2e-only dependencies from xtask (bollard, kube, k8s-openapi, cliclack, tar, base64)
  • Remove e2e and colima mise tasks
  • Update AGENTS.md, CLAUDE.md, README.md

Local development uses mise run dev (see !896 (merged)). The E2E harness deployed a full GitLab instance into Colima for redaction testing but is being retired in favor of integration tests.

Relates to #464 (closed)

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