Apply Upgrade Notes

Upgrading the skills collection updates the skill instructions, but not the artifacts a previous skill run installed into this repository — notably tracker descriptors at .ai/trackers/<tracker>.md and browser-provider descriptors at .ai/browsers/<provider>.md. A stale descriptor can degrade or skip operations it does not define. This skill reads the collection's UPGRADE_NOTES.md, brings installed artifacts up to date, and reports what it changed.

It touches only pipeline artifacts under .ai/ (and documented config files). It never edits application source, never modifies the skills installation itself, and never discards a local customization without asking.

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