v0.7.0 — safety accounting, resource filter, Gantt polish

• schedule.csv now carries realistic_duration for every task that has one (empty for buffers/milestones). Filter by chain to audit how much safety left the tasks versus what landed in that chain's buffer — the "shared insurance" conversation behind CCPM buffer sizing. The network graph reads estimates from the schedule directly; graph --tasks remains as the fallback for pre-v0.7 schedule files.
• project-network.html resource filter (All resources / Unassigned / each named resource): matching tasks stay solid while the rest fades, so each team member sees their part in the context of the whole plan.
• Gantt polish: long task labels no longer clip at the left edge; dotted horizontal guides per task row and per resource row make it easy to trace a label to its bar.

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