Codify the most recent successful /scrape flow into a permanent
browser-skill on disk. Future /scrape calls with the same intent run
the codified script in ~200ms instead of re-driving the page. Walks
back through the conversation, synthesizes script.ts + script.test.ts
+ fixture, runs the test in a temp dir, and asks before committing.
Use when asked to "skillify", "codify", "save this scrape", or
"make this permanent". (gstack)
