Toil Mining — rank repeated friction

Mine explicitly supplied session, shell, RTK, or CASS history without modifying the sources. The result is evidence for a caller; this skill does not file work, schedule automation, or mutate a tracker.

Constraints

• Read-only over the supplied sources, because the skill gathers evidence and must never become a mutation lane.
• No work creation: it never files a tracker item, schedules automation, or names an owner, because those are caller decisions the evidence informs.
• Measured, not remembered: every count, cost, and error rate is read from the supplied history, so recency and salience cannot masquerade as frequency.
• Observations stay separate from recommendations, so a caller can re-weigh the ranking without inheriting an unstated conclusion.

Procedure