chore(agents): update skill metadata timestamps, source URLs, and documentation wording across dot_agents files

dot_agents/skills/diagnosing-bugs/scripts/hitl-loop.template.sh

@@ -11,6 +11,9 @@
 #   capture VAR "<question>"      → show question, read response into VAR
 #
 # At the end, captured values are printed as KEY=VALUE for the agent to parse.
+#
+# `capture` prints its value back to the terminal, where the agent reads it — so
+# capture observations, and leave signing in to the user as a `step`.
 
 set -euo pipefail