First commit of the cleanup log to the repo — previously maintained
as an uncommitted working document across sessions.
31 original items triaged. 11 moved to Resolved section with phase
references (6a through 6k, PROJECT-BIBLE rewrite, pi-nas decommission).
5 new backlog items added (duplicate consolidation, legacy data/text
dirs, backup architecture, signal-archive, Phase 5a edge cases).
4,771 duplicate PDFs marked PARTIALLY RESOLVED (hash-match dupes
handled; same-content-different-bytes clusters split to new item).
