Extends the fix from PR #424 to also validate the BEADS_DIR environment
variable. Previously, only the directory tree search was validated, but
BEADS_DIR could still point to a daemon-only directory.
Changes:
- Add validation to BEADS_DIR path using hasBeadsProjectFiles()
- Add comprehensive test for BEADS_DIR validation
- Test verifies both rejection of daemon-only dirs and acceptance of valid dirs
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Co-Authored-By: Claude <noreply@anthropic.com>
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