Curate agent sessions into trajectory material

Turns a large pile of claude_code / codex transcripts into a small, provably unmodified corpus that an agent can analyze.

scripts/curate-sessions.sh — no index, no daemon, no network. python3 is a prerequisite of the skill, not of one branch: the selection engine is scripts/funnel.py, and there is no supported path that reaches a corpus without it.

The core property: the kept files are byte-identical copies of the originals, each with a recorded sha256. Nothing is re-rendered, summarized, or converted, so downstream analysis reads the real trajectory (every tool call and result), not a lossy view of it.

Pipeline