Linux packages: migrate /etc/boundary.d to /etc/threshold.d without
clobbering, reuse the boundary service user, carry over service
enablement with a boundary.service alias, provide a boundary command.
Docker: accept /boundary/config.hcl, boundary command, /boundary symlink.
CLI: deprecation notice when invoked as boundary (stderr only).
Dev mode: also create *.threshold.dev aliases.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
shadowdaoandClaude Sonnet 5.5
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