2.15.0

• "View details" on the Plugins screen opens a real details modal instead of reading "Plugin not found". That link asks the wordpress.org API about the plugin's slug, and a self-hosted plugin is not there, so the request 404s. The plugin now answers for its own slug and leaves every other plugin alone.
• The modal's content is read from readme.txt and the current GitHub release, so it cannot drift from what shipped — the same reason the Changelog screen is rendered from readme.txt rather than a second copy in code.
• "View details" is now present whether or not an update is pending. WordPress only shows the link for a plugin it holds a slug for, and it takes that slug from the update check, so previously the link appeared only while an update was waiting.
• Fix: "Tested up to" was read from the plugin headers, which never carry it — WordPress does not recognise that header, so the value reported alongside an update was always empty. It comes from readme.txt now.