drive e2e from scenario yaml fixtures

[atkrad]

Summary

• Drive Kind e2e from scenarios/*/e2e.yaml instead of typed expect.yaml under internal/e2e/testdata/.
• Run fixtures in-process with nabattest.WithDir so parallel cases do not chdir.
• Resolve --spec, kubeconfig, platform file, and env files against the spec directory, not process cwd.

Related

Refs #39
Refs #41

Test plan

• Unit tests added/updated
• Scenario under scenarios/ (if behavior changes)
• nix run .#lint / pre-commit clean
• Manual smoke (command + expected result), if user-facing
• nix run .#test-e2e on a live Kind cluster

Labels

• One of: kind/chore
• Add breaking-change if this breaks existing CLI or config behavior
• Add skip-changelog for internal-only PRs that should not appear in notes

Checklist

• Title is short and imperative (matches commit style)
• Docs / CLI help updated when user-facing (README.md, docs/cli/)
• No secrets or local-only paths in the diff

[codecov]

Codecov Report

❌ Patch coverage is 80.60837% with 51 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
internal/testing/subset.go	74.13%	30 Missing ⚠️
internal/testing/e2e_fixture.go	86.40%	17 Missing ⚠️
internal/cmd/root.go	50.00%	2 Missing ⚠️
internal/spec/loader.go	90.90%	1 Missing ⚠️
internal/testing/scenario_discovery.go	85.71%	1 Missing ⚠️

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