personal memory agent

release: solstone 0.5.6 master

Bump 0.5.5 -> 0.5.6. Six commits since v0.5.5: pair-link join over the secure listener (cert-less transport fix), cogitate force-finish spend logging, backup + link app VPX experience passes, and the backup CLI naming reconciliation. make ci green on the final tree (11633 passed). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>