skills, agents, CLAUDE.md: correct claims the code refutes and drop dated prompt patterns

Prompt audit of the harness files. hil/SKILL.md's banner rules predate
3963a1b70, which keeps the finished boards' rows on a pool timeout or a
worker crash and says so in the banner; the no-boards bullet is the drift
docs/superpowers/followup/pr3840-skill-md-no-boards-drift.md records. The
unit-suite paragraph counted five suites (there are seven; measured 64 s,
not 48) and the hil_lock.py line citations had already moved. The rest
replaces numeric commentary caps, a history clause, a branch pointer, an
install path and one accreted paragraph with the rule each stood in for.