advise-jfr

Turns a Jeffrey profile into concrete code changes in the current repository — maps the hottest CPU, wall-clock, allocation and blocking frames, the slowest traces, the waiting on locks and I/O, and the database and HTTP work to real source, recommends minimal behaviour-preserving edits, applies them on request and verifies with the tests and a re-profile. Use whenever the user asks what to change, optimise or fix based on a profile, JFR recording, flamegraph or trace, why an endpoint is slow and what to do about it, or a hotspot is known and the question is what to do about it.