OPS-137 orphan/scratch sweeper - owner resolution measured, design note delivered

IN PROGRESS, no code yet - scope/cadence held for Elazar. Design note: /resource/ops137/design/2026-08-23-owner-resolution-design-note.md. Measured venus 2026-08-23: /tmp/claude-1000 = 181 dirs / 3.1G; owner confidently nameable for 24 (13%) via each session's own tool-result self-declaration; 99 unresolvable by any measured means. Two dirs held 2.9G of 3.1G, both live agents - two DMs took /tmp from 97% to 48% with nothing deleted by me. RULES ESTABLISHED: (1) age must NOT be a discriminator, it sweeps hardest where ownership is least known; (2) an instrument that appears in its own sample is not corroboration - a transcript-grep resolver scored 12/12 purely against my own transcript because my enumeration had written those uuids into it; (3) the unresolvable set is reported, never swept. Reviewed by pm-llmmsgsrv-cc + monitor-context-cc, no objections.