v0.6.0 — realistic estimates in the network graph

• graph --tasks tasks.csv (library: tasks= / load_tasks) enriches each task node with its realistic duration estimate: the hover tooltip reads "(5d optimal, 10d realistic)" and the inspector gains an Estimates row — optimal 5d · realistic 10d (50% safety pooled into buffers) — so teams can review the optimal/realistic balance right on the network view. Without --tasks, output is unchanged.

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