* Port onboardingV2 skill into skills/onboarding and add its eval suite
* chore(onboarding): drop files unused by the v2 flow
Remove first-flag/, references/1.8-summary.md, and references/1.9-editor-rules.md
(the v2 flow has no summary or editor-rules step) and repoint every reference to
the parent skill's Step 4.
* fix(onboarding): resolve mcp/fm contradiction and Cursor toggle name
Drop the edge case claiming mcp/fm needs no migration, which contradicted the
adjacent deprecation prompt, and name the Cursor toggle after the server the
config actually writes.
* fix(evals): score onboarding against the real trajectory
ari-launchdarkly