Small tools that save whole turns

The ones you'll use

• fm edit applies a batch of exact replacements across files, all or none.
• fm why FILE:LINE traces a line back to the task and the words you asked in.
• fm at T-0042 -- pytest runs any command as of a task's start.
• fm tour --since main ranks a branch by review risk and says what's safe to skim.
• fm digest sums up the week.