Detects edit/test/fix retry cycles (Edit -> Bash -> Edit) within each
turn. Shows 1-shot percentage in the By Activity panel for categories
that involve code edits. Updated screenshot and README.
Fixes#4
Tool results in JSONL are type:"user" entries with no text content.
groupIntoTurns was flushing on every type:"user" entry, creating
phantom turns that got classified as Conversation. Now only flush
when the user entry contains actual text.
Fixes#7
