v1.2.12

• fix: bare delv/drill no longer accepted as dns delegation traces (drill -T kept)
• fix: ssh -A alternative required the stated user@host
• fix: 2dd/2cc in vi mode no longer wipe the yank register
• harden: dash-leading contains: patterns can't parse as grep options
• clean: 127 unreachable manpage-shadowed EXP entries removed, dead code sweep
• tests/audit: removed dead tests, fixed a tautology, phase3 alternate-answer guard