## Summary
Follow-up to 23aad213 which removed redundant FsFile close() calls from
the codebase. This updates CLAUDE.md so AI agents and contributors stop
reintroducing them. Adds the build flag to the Critical Build Flags
section with a clear "do not add file.close() on local FsFile variables"
rule, enumerates the three cases where explicit close is still required
(close before Storage.remove, close before reopening the same variable,
and member variables that outlive function scope), and updates the
HalStorage example, RAII guidance, and Activity Lifecycle sections to be
consistent with the new policy.
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### AI Usage
While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.
Did you use AI tools to help write this code? _**YES**_
Zach Nelson
a48ad3cd61