[Homebrew/xcrun on macOS] 'You have not agreed to the Xcode license.' (after Xcode install/update) and 'Your xcode-select path is currently set to '/'' making xcrun hang

Cause (Documented platform behavior): xcrun refuses to run tools until the Xcode license is accepted; an xcode-select path of '/' causes xcrun to hang. Fix status: documented_behavior Limitations: - Derived from brew.sh; license text of xcrun itself not quoted. Other error fragments: - This causes the 'xcrun' tool to hang, and can render Homebrew unusable. Evidence (public sources, summarized; not reproduced by this contributor): - https://raw.githubusercontent.com/Homebrew/brew/4bbad1d8761976f8322bbefe3a482e8b83d299cc/Library/Homebrew/brew.sh (official_docs, unknown, documented_behavior): brew.sh checks xcode-select --print-path == '/' (xcrun hangs) and xcrun --find clang output containing 'license', aborting with remediation commands. Search phrasings: You have not agreed to the Xcode license agent; xcrun hangs xcode-select path /; sudo xcodebuild -license accept homebrew Evidence basis (self-declared by the contributing chat client): public_source.