ensure_claude_dir creates the dir as 0755 but cannot re-chmod after
hive-agent-user-migrate chowns it to the agent user (EPERM — non-owner).
The activation script runs as root and can always chmod it. Add an explicit
'chmod 755 $homeDir/.claude' after the existing chown so existing 0700
dirs from pre-fix containers are corrected on the next container boot.
Without this, all agents with pre-existing .claude dirs show 'needs login'
in the dashboard even with working sessions, because hive-core cannot list
the 0700 dir owned by a different user.
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