Move condition-based-waiting, defense-in-depth, and root-cause-tracing
into systematic-debugging as progressive disclosure supporting files.
These techniques are now available as reference material within the
systematic-debugging skill directory, reducing skill count while keeping
content accessible when needed.
Note: Claude Code's SLASH_COMMAND_TOOL_CHAR_BUDGET env variable silently
limits skill discovery, which drove this consolidation to ensure core
skills remain visible.
