docs(plans): starter packs review round
Design review (8 findings) and security review (6 findings) fixed:
expected flagged lines per proposed hire, applyPack writer op, loader-set
origin, organization.change holders for board and workflow writes,
filtered-view board labels, workflow prompt guidance (inert, no runner),
system-type retired for one release before removal, installed packs
classified as executable PL1 code, saved-template placeholders and
free-text preview, pinned proposals, and removal tombstones.