chore: sync core lib and CLAUDE.md from agent-core

[avifenesh]

Automated sync of lib/ and CLAUDE.md from agent-core.

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Note

Medium Risk
Changes file read/write behavior in lib/enhance/fixer.js to error out when targets (or .backup files) are symlinks, which could break existing workflows that relied on symlinks but reduces risk of unintended writes to sensitive paths.

Overview
Hardens the auto-fix/restore flow by adding assertNotSymlink and using it to refuse reading from or writing to symlinked targets (including .backup siblings).

applyFixes now checks for symlinks before reading, before writing backups, and immediately before writing changes to narrow TOCTOU symlink-swap attacks; restoreFromBackup adds the same protections. The new helper is exported for external use.

^{Reviewed by Cursor Bugbot for commit d8c9c6b. Configure here.}

[gemini-code-assist]

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