Adds a new "procedural" tree type for linear step-by-step project workflows
(domain controller setup, M365 onboarding, VPN config, etc). Includes intake
form builder, two-panel step navigation, variable resolution, procedural
exports, 3 seed templates, and UI rename from "Trees" to "Flows".
Also archives 19 implemented plan docs and creates deferred features backlog.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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