task-observer: new-session updates from 2026-05-13

[divad12]

Target

skill: .agents/skills/new-session/SKILL.md

Observations addressed

• Observation 12 (journology/log.md): Reuse existing clean worktrees before creating another — when work accidentally lands in the main checkout, creating a new worktree adds sprawl if a clean one already exists → changed: added "Worktree recovery" section with a 3-step flow: check existing worktrees, checkpoint the integration branch, fast-forward the clean worktree; only create a new one if no suitable candidate exists

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